Every problem in the chapter beside the book’s answer, a chapter at a time as you scroll.

Chapter 2: The Language of Algebra

348 problems · 13 figures

Be Prepared 2.1 §2.1 source ↗

Add:43+69.
If you missed this problem, review Example 1.19.
Example 1.19 in the book ↗

Answer

112

Be Prepared 2.2 §2.1 source ↗

Multiply:(896)201.
If you missed this problem, review Example 1.48.
Example 1.48 in the book ↗

Answer

180 , 096

Be Prepared 2.3 §2.1 source ↗

Divide:7,263÷9.
If you missed this problem, review Example 1.64.
Example 1.64 in the book ↗

Answer

807

Try It 2.1 §2.1 source ↗

Translate from algebra to words.

ⓐ 18+11

ⓑ (27)(9)

ⓒ 84÷7

ⓓ p−q

Answer

ⓐ 18 plus 11; the sum of eighteen and eleven

ⓑ 27 times 9; the product of twenty-seven and nine

ⓒ 84 divided by 7; the quotient of eighty-four and seven

ⓓ p minus q; the difference of p and q

Try It 2.2 §2.1 source ↗

Translate from algebra to words.

ⓐ 47−19

ⓑ 72÷9

ⓒ m+n

ⓓ (13)(7)

Answer

ⓐ 47 minus 19; the difference of forty-seven and nineteen

ⓑ 72 divided by 9; the quotient of seventy-two and nine

ⓒ m plus n; the sum of m and n

ⓓ 13 times 7; the product of thirteen and seven

Try It 2.3 §2.1 source ↗

Translate from algebra to words.

ⓐ 14≤27

ⓑ 19−2≠8

ⓒ 12>4÷2

ⓓ x−7<1

Answer

ⓐ fourteen is less than or equal to twenty-seven

ⓑ nineteen minus two is not equal to eight

ⓒ twelve is greater than four divided by two

ⓓ x minus seven is less than one

Try It 2.4 §2.1 source ↗

Translate from algebra to words.

ⓐ 19≥15

ⓑ 7=12−5

ⓒ 15÷3<8

ⓓ y-3>6

Answer

ⓐ nineteen is greater than or equal to fifteen

ⓑ seven is equal to twelve minus five

ⓒ fifteen divided by three is less than eight

ⓓ y minus three is greater than six

Try It 2.5 §2.1 source ↗

Use Figure 2.2 to fill in the appropriate symbol, =, <, or>.

ⓐ MPG of Prius_____MPG of Versa

ⓑ MPG of Mini Cooper_____ MPG of Corolla

Figure 2.2 in the book ↗
(credit: modification of work by Bernard Goldbach, Wikimedia Commons)

Answer

ⓐ >

ⓑ <

Try It 2.6 §2.1 source ↗

Use Figure 2.2 to fill in the appropriate symbol, =, <, or>.

ⓐ MPG of Fit_____ MPG of Prius

ⓑ MPG of Corolla _____ MPG of Fit

Figure 2.2 in the book ↗
(credit: modification of work by Bernard Goldbach, Wikimedia Commons)

Answer

ⓐ <

ⓑ >

Try It 2.7 §2.1 source ↗

Determine if each is an expression or an equation:

ⓐ 23+6=29

ⓑ 7·3−7

Answer

ⓐ equation

ⓑ expression

Try It 2.8 §2.1 source ↗

Determine if each is an expression or an equation:

ⓐ y÷14

ⓑ x−6=21

Answer

ⓐ expression

ⓑ equation

Try It 2.9 §2.1 source ↗

Write each expression in exponential form:

41·41·41·41·41

Answer

415

Try It 2.10 §2.1 source ↗

Write each expression in exponential form:

7·7·7·7·7·7·7·7·7

Answer

79

Try It 2.11 §2.1 source ↗

Write each exponential expression in expanded form:

ⓐ 48

ⓑ a7

Answer

ⓐ 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4

ⓑ a · a · a · a · a · a · a

Try It 2.12 §2.1 source ↗

Write each exponential expression in expanded form:

ⓐ 88

ⓑ b6

Answer

ⓐ 8 · 8 · 8 · 8 · 8 · 8 · 8 · 8

ⓑ b · b · b · b · b · b

Try It 2.13 §2.1 source ↗

Simplify:

ⓐ 53

ⓑ 17

Answer

ⓐ 125

ⓑ 1

Try It 2.14 §2.1 source ↗

Simplify:

ⓐ 72

ⓑ 05

Answer

ⓐ 49

ⓑ 0

Try It 2.15 §2.1 source ↗

Simplify the expressions:

ⓐ 12−5·2

ⓑ (12−5)·2

Answer

ⓐ 2

ⓑ 14

Try It 2.16 §2.1 source ↗

Simplify the expressions:

ⓐ 8+3·9

ⓑ (8+3)·9

Answer

ⓐ 35

ⓑ 99

Try It 2.17 §2.1 source ↗

Simplify:

42÷7·3

Answer

18

Try It 2.18 §2.1 source ↗

Simplify:

12·3÷4

Answer

9

Try It 2.19 §2.1 source ↗

Simplify:

30÷5+ 10(3−2)

Answer

16

Try It 2.20 §2.1 source ↗

Simplify:

70÷10+ 4(6−2)

Answer

23

Try It 2.21 §2.1 source ↗

Simplify:

9+ 53− [4(9+3)]

Answer

86

Try It 2.22 §2.1 source ↗

Simplify:

72− 2[4(5+1)]

Answer

1

Try It 2.23 §2.1 source ↗

Simplify:

32+24÷2+43

Answer

81

Try It 2.24 §2.1 source ↗

Simplify:

62−53÷5+82

Answer

75

2.1-1 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

16 − 9

Answer

16 minus 9, the difference of sixteen and nine

2.1-3 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

5 · 6

Answer

5 times 6, the product of five and six

2.1-5 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

28 ÷ 4

Answer

28 divided by 4, the quotient of twenty-eight and four

2.1-7 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

x + 8

Answer

x plus 8, the sum of x and eight

2.1-9 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

( 2 ) ( 7 )

Answer

2 times 7, the product of two and seven

2.1-11 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

14 < 21

Answer

fourteen is less than twenty-one

2.1-13 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

36 ≥ 19

Answer

thirty-six is greater than or equal to nineteen

2.1-15 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

3 n = 24

Answer

3 times n equals 24, the product of three and n equals twenty-four

2.1-17 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

y − 1 > 6

Answer

y minus 1 is greater than 6, the difference of y and one is greater than six

2.1-19 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

2 ≤ 18 ÷ 6

Answer

2 is less than or equal to 18 divided by 6; 2 is less than or equal to the quotient of eighteen and six

2.1-21 §2.1 source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebraic notation to words.

a ≠ 7 · 4

Answer

a is not equal to 7 times 4, a is not equal to the product of seven and four

2.1-23 §2.1 source ↗

Identify Expressions and Equations

In the following exercises, determine if each is an expression or an equation.

9 · 6 = 54

Answer

equation

2.1-25 §2.1 source ↗

Identify Expressions and Equations

In the following exercises, determine if each is an expression or an equation.

5 · 4 + 3

Answer

expression

2.1-27 §2.1 source ↗

Identify Expressions and Equations

In the following exercises, determine if each is an expression or an equation.

x + 7

Answer

expression

2.1-29 §2.1 source ↗

Identify Expressions and Equations

In the following exercises, determine if each is an expression or an equation.

y − 5 = 25

Answer

equation

2.1-31 §2.1 source ↗

Simplify Expressions with Exponents

In the following exercises, write in exponential form.

3 · 3 · 3 · 3 · 3 · 3 · 3

Answer

37

2.1-33 §2.1 source ↗

Simplify Expressions with Exponents

In the following exercises, write in exponential form.

x · x · x · x · x

Answer

x 5

2.1-35 §2.1 source ↗

In the following exercises, write in expanded form.

5 3

Answer

5 · 5 · 5

2.1-37 §2.1 source ↗

In the following exercises, write in expanded form.

2 8

Answer

2 · 2 · 2 · 2 · 2 · 2 · 2 · 2

2.1-39 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

ⓐ 3+8·5

ⓑ (3+8)·5

Answer

ⓐ 43

ⓑ 55

2.1-41 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

2 3 − 12 ÷ ( 9 − 5 )

Answer

5

2.1-43 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

3 · 8 + 5 · 2

Answer

34

2.1-45 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

2 + 8 ( 6 + 1 )

Answer

58

2.1-47 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

4 · 12 / 8

Answer

6

2.1-49 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

6 + 10 / 2 + 2

Answer

13

2.1-51 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

( 6 + 10 ) ÷ ( 2 + 2 )

Answer

4

2.1-53 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

20 ÷ 4 + 6 · 5

Answer

35

2.1-55 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

20 ÷ ( 4 + 6 ) · 5

Answer

10

2.1-57 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

4 2 + 5 2

Answer

41

2.1-59 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

( 4 + 5 ) 2

Answer

81

2.1-61 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

3 ( 1 + 9 · 6 ) − 4 2

Answer

149

2.1-63 §2.1 source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

2 [ 1 + 3 ( 10 − 2 ) ]

Answer

50

Be Prepared 2.4 §2.2 source ↗

Is n÷5 an expression or an equation?
If you missed this problem, review Example 2.4.
Example 2.4 in the book ↗

Answer

expression

Be Prepared 2.5 §2.2 source ↗

Simplify 45.
If you missed this problem, review Example 2.7.
Example 2.7 in the book ↗

Answer

1 , 024

Be Prepared 2.6 §2.2 source ↗

Simplify 1+8⋅9.
If you missed this problem, review Example 2.8.
Example 2.8 in the book ↗

Answer

73

Try It 2.25 §2.2 source ↗

Evaluate:

y+4when

ⓐ y=6

ⓑ y=15

Answer

ⓐ 10

ⓑ 19

Try It 2.26 §2.2 source ↗

Evaluate:

a−5when

ⓐ a=9

ⓑ a=17

Answer

ⓐ 4

ⓑ 12

Try It 2.27 §2.2 source ↗

Evaluate:

8x−3,when

ⓐ x=2

ⓑ x=1

Answer

ⓐ 13

ⓑ 5

Try It 2.28 §2.2 source ↗

Evaluate:

4y−4,when

ⓐ y=3

ⓑ y=5

Answer

ⓐ 8

ⓑ 16

Try It 2.29 §2.2 source ↗

Evaluate:

x2whenx=8.

Answer

64

Try It 2.30 §2.2 source ↗

Evaluate:

x3whenx=6.

Answer

216

Try It 2.31 §2.2 source ↗

Evaluate:

2xwhenx=6.

Answer

64

Try It 2.32 §2.2 source ↗

Evaluate:

3xwhenx=4.

Answer

81

Try It 2.33 §2.2 source ↗

Evaluate:

2x+ 5y− 4whenx= 11andy= 3

Answer

33

Try It 2.34 §2.2 source ↗

Evaluate:

5x− 2y− 9whenx= 7andy= 8

Answer

10

Try It 2.35 §2.2 source ↗

Evaluate:

3x2+ 4x+ 1whenx= 3.

Answer

40

Try It 2.36 §2.2 source ↗

Evaluate:

6x2− 4x− 7whenx= 2.

Answer

9

Try It 2.37 §2.2 source ↗

Identify all terms in the given expression, and their coefficients:

4x+3b+2

Answer

The terms are 4x, 3b, and 2. The coefficients are 4, 3, and 2.

Try It 2.38 §2.2 source ↗

Identify all terms in the given expression, and their coefficients:

9a+13a2+a3

Answer

The terms are 9a, 13a2, and a3, The coefficients are 9, 13, and 1.

Try It 2.39 §2.2 source ↗

Identify the like terms in the list or the expression:

9, 2x3, y2, 8x3, 15, 9y, 11y2

Answer

9 and 15; 2x3 and 8x3; y2 and 11y2

Try It 2.40 §2.2 source ↗

Identify the like terms in the list or the expression:

4x3+ 8x2+ 19+ 3x2+ 24+ 6x3

Answer

4x3 and 6x3; 8x2 and 3x2; 19 and 24

Try It 2.41 §2.2 source ↗

Simplify:

7x+9+9x+8

Answer

16x + 17

Try It 2.42 §2.2 source ↗

Simplify:

5y+ 2+ 8y+ 4y+ 5

Answer

17y + 7

Try It 2.43 §2.2 source ↗

Simplify:

3x2+ 9x+ x2+ 5x

Answer

4x2 + 14x

Try It 2.44 §2.2 source ↗

Simplify:

11y2+ 8y+ y2+ 7y

Answer

12y2 + 15y

Try It 2.45 §2.2 source ↗

Translate the given word phrase into an algebraic expression:

ⓐ the difference of 47 and 41

ⓑ the quotient of 5x and 2

Answer

ⓐ 47 − 41

ⓑ 5x ÷ 2

Try It 2.46 §2.2 source ↗

Translate the given word phrase into an algebraic expression:

ⓐ the sum of 17 and 19

ⓑ the product of 7 and x

Answer

ⓐ 17 + 19

ⓑ 7x

Try It 2.47 §2.2 source ↗

Translate each word phrase into an algebraic expression:

ⓐ Eleven more than x

ⓑ Fourteen less than 11a

Answer

ⓐ x + 11

ⓑ 11a − 14

Try It 2.48 §2.2 source ↗

Translate each word phrase into an algebraic expression:

ⓐ 19 more than j

ⓑ 21 less than 2x

Answer

ⓐ j + 19

ⓑ 2x − 21

Try It 2.49 §2.2 source ↗

Translate the word phrase into an algebraic expression:

ⓐ four times the sum of p and q

ⓑ the sum of four times p and q

Answer

ⓐ 4(p + q)

ⓐ 4p + q

Try It 2.50 §2.2 source ↗

Translate the word phrase into an algebraic expression:

ⓐ the difference of two times xand 8

ⓑ two times the difference of xand8

Answer

ⓐ 2x − 8

ⓑ 2(x − 8)

Try It 2.51 §2.2 source ↗

The length of a rectangle is 5 inches less than the width. Let w represent the width of the rectangle. Write an expression for the length of the rectangle.

Answer

w − 5

Try It 2.52 §2.2 source ↗

The width of a rectangle is 2 meters greater than the length. Let l represent the length of the rectangle. Write an expression for the width of the rectangle.

Answer

l + 2

Try It 2.53 §2.2 source ↗

Geoffrey has dimes and quarters in his pocket. The number of dimes is seven less than six times the number of quarters. Let q represent the number of quarters. Write an expression for the number of dimes.

Answer

6q − 7

Try It 2.54 §2.2 source ↗

Lauren has dimes and nickels in her purse. The number of dimes is eight more than four times the number of nickels. Let n represent the number of nickels. Write an expression for the number of dimes.

Answer

4n + 8

2.2-69 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

7 x + 8 when x = 2

Answer

22

2.2-71 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

5 x − 4 when x = 6

Answer

26

2.2-73 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

x 2 when x = 12

Answer

144

2.2-75 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

x 5 when x = 2

Answer

32

2.2-77 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

3 x when x = 3

Answer

27

2.2-79 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

x 2 + 3x− 7whenx= 4

Answer

21

2.2-81 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

2x+ 4y− 5whenx= 7, y= 8

Answer

41

2.2-83 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

( x − y ) 2 whenx= 10, y= 7

Answer

9

2.2-84 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

( x + y ) 2 whenx= 6, y= 9

Answer

225

2.2-85 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

a 2 + b 2 whena= 3, b= 8

Answer

73

2.2-87 §2.2 source ↗

Evaluate Algebraic Expressions

In the following exercises, evaluate the expression for the given value.

2l+ 2wwhenl= 15, w= 12

Answer

54

2.2-89 §2.2 source ↗

Identify Terms, Coefficients, and Like Terms

In the following exercises, list the terms in the given expression.

15 x 2 + 6 x + 2

Answer

15x2, 6x, 2

2.2-91 §2.2 source ↗

Identify Terms, Coefficients, and Like Terms

In the following exercises, list the terms in the given expression.

10 y 3 + y + 2

Answer

10y3, y, 2

2.2-93 §2.2 source ↗

In the following exercises, identify the coefficient of the given term.

8 a

Answer

8

2.2-95 §2.2 source ↗

In the following exercises, identify the coefficient of the given term.

5 r 2

Answer

5

2.2-97 §2.2 source ↗

In the following exercises, identify all sets of like terms.

x 3 , 8x, 14, 8y, 5, 8 x 3

Answer

x3 and 8x3; 14 and 5

2.2-99 §2.2 source ↗

In the following exercises, identify all sets of like terms.

9a, a 2 , 16ab, 16 b 2 , 4ab, 9 b 2

Answer

16ab and 4ab; 16b2 and 9b2

2.2-101 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

10 x + 3 x

Answer

13x

2.2-103 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

17 a + 9 a

Answer

26a

2.2-105 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

4 c + 2 c + c

Answer

7c

2.2-107 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

9 x + 3 x + 8

Answer

12x + 8

2.2-109 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

7 u + 2 + 3 u + 1

Answer

10u + 3

2.2-111 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

7 p + 6 + 5 p + 4

Answer

12p + 10

2.2-113 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

10a+ 7+ 5a− 2+ 7a− 4


Answer

22a + 1

2.2-115 §2.2 source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the given expression by combining like terms.

3 x 2 + 12x+ 11+ 14 x 2 + 8x+ 5

Answer

17x2 + 20x + 16

2.2-117 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The sum of 8 and 12

Answer

8 + 12

2.2-119 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The difference of 14 and 9

Answer

14 − 9

2.2-121 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The product of 9 and 7

Answer

9 ⋅ 7

2.2-123 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The quotient of 36 and 9

Answer

36 ÷ 9

2.2-125 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The difference of x and 4

Answer

x − 4

2.2-127 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The product of 6 and y

Answer

6y

2.2-129 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The sum of 8x and 3x

Answer

8x + 3x

2.2-131 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

The quotient of y and 3

Answer

y ÷ 3

2.2-133 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

Eight times the difference of y and nine

Answer

8 (y − 9)

2.2-135 §2.2 source ↗

Translate English Phrases into Algebraic Expressions

In the following exercises, translate the given word phrase into an algebraic expression.

Five times the sum of x and y

Answer

5 (x + y)

2.2-137 §2.2 source ↗

In the following exercises, write an algebraic expression.

Adele bought a skirt and a blouse. The skirt cost $15 more than the blouse. Let b represent the cost of the blouse. Write an expression for the cost of the skirt.

Answer

b + 15

2.2-139 §2.2 source ↗

In the following exercises, write an algebraic expression.

The number of girls in a second-grade class is 4 less than the number of boys. Let b represent the number of boys. Write an expression for the number of girls.

Answer

b − 4

2.2-141 §2.2 source ↗

In the following exercises, write an algebraic expression.

Greg has nickels and pennies in his pocket. The number of pennies is seven less than twice the number of nickels. Let n represent the number of nickels. Write an expression for the number of pennies.

Answer

2n − 7

2.2-143 §2.2 source ↗

In the following exercises, use algebraic expressions to solve the problem.

Car insurance Justin’s car insurance has a $750 deductible per incident. This means that he pays $750 and his insurance company will pay all costs beyond $750. If Justin files a claim for $2,100, how much will he pay, and how much will his insurance company pay?

Answer

He will pay $750. His insurance company will pay $1350.

Be Prepared 2.7 §2.3 source ↗

Evaluatex+ 8whenx= 11.
If you missed this problem, review Example 2.13.
Example 2.13 in the book ↗

Answer

19

Be Prepared 2.8 §2.3 source ↗

Evaluate5x− 3whenx= 9.
If you missed this problem, review Example 2.14.
Example 2.14 in the book ↗

Answer

42

Be Prepared 2.9 §2.3 source ↗

Translate into algebra: the difference of x and 8.
If you missed this problem, review Example 2.24.
Example 2.24 in the book ↗

Answer

x − 8

Try It 2.55 §2.3 source ↗

Isx= 3a solution of4x− 7= 16?

Answer

no

Try It 2.56 §2.3 source ↗

Isx= 2a solution of6x− 2= 10?

Answer

yes

Try It 2.57 §2.3 source ↗

Isy= 3a solution of9y− 2= 8y+ 1?

Answer

yes

Try It 2.58 §2.3 source ↗

Isy= 4a solution of5y− 3= 3y+ 5?

Answer

yes

Try It 2.59 §2.3 source ↗

Write the equation modeled by the envelopes and counters, and then solve the equation:

The image is divided in half vertically. On the left side is an envelope with one counter below it. On the right side is 7 counters.The image is divided in half vertically. On the left side is an envelope with one counter below it. On the right side is 7 counters.

Answer

x + 1 = 7; x = 6

Try It 2.60 §2.3 source ↗

Write the equation modeled by the envelopes and counters, and then solve the equation:

The image is divided in half vertically. On the left side is an envelope with three counters below it. On the right side is 4 counters.The image is divided in half vertically. On the left side is an envelope with three counters below it. On the right side is 4 counters.

Answer

x + 3 = 4; x = 1

Try It 2.61 §2.3 source ↗

Solve:

x+6=19

Answer

x = 13

Try It 2.62 §2.3 source ↗

Solve:

x+9=14

Answer

x = 5

Try It 2.63 §2.3 source ↗

Solve:

95=y+67

Answer

y = 28

Try It 2.64 §2.3 source ↗

Solve:

91=y+45

Answer

y = 46

Try It 2.65 §2.3 source ↗

Solve:

x−9=13

Answer

x = 22

Try It 2.66 §2.3 source ↗

Solve:

y−1=3

Answer

y = 4

Try It 2.67 §2.3 source ↗

Solve:

19=a−18

Answer

a = 37

Try It 2.68 §2.3 source ↗

Solve:

27=n−14

Answer

n = 41

Try It 2.69 §2.3 source ↗

Translate the sentence into an algebraic equation:

The sum of 7 and 6 gives 13.

Answer

7 + 6 = 13

Try It 2.70 §2.3 source ↗

Translate the sentence into an algebraic equation:

The sum of 8 and 6 is 14.

Answer

8 + 6 = 14

Try It 2.71 §2.3 source ↗

Translate the sentence into an algebraic equation:

The product of 6 and 9 is 54.

Answer

6 ⋅ 9 = 54

Try It 2.72 §2.3 source ↗

Translate the sentence into an algebraic equation:

The product of 21 and 3 gives 63.

Answer

21 ⋅ 3 = 63

Try It 2.73 §2.3 source ↗

Translate the given sentence into an algebraic equation:

Twice the difference of x and 5 gives 30.

Answer

2(x − 5) = 30

Try It 2.74 §2.3 source ↗

Translate the given sentence into an algebraic equation:

Twice the difference of y and 4 gives 16.

Answer

2(y − 4) = 16

Try It 2.75 §2.3 source ↗

Translate and solve:

Seven more than x is equal to 37.

Answer

x + 7 = 37; x = 30

Try It 2.76 §2.3 source ↗

Translate and solve:

Eleven more than y is equal to 28.

Answer

y + 11 = 28; y = 17

Try It 2.77 §2.3 source ↗

Translate and solve:

The difference of z and 17 is equal to 37.

Answer

z − 17 = 37; z = 54

Try It 2.78 §2.3 source ↗

Translate and solve:

The difference of x and 19 is equal to 45.

Answer

x − 19 = 45; x = 64

2.3-147 §2.3 source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each given value is a solution to the equation.

x+13=21

ⓐ x=8

ⓑ x=34

Answer

ⓐ yes

ⓑ no

2.3-149 §2.3 source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each given value is a solution to the equation.

m−4=13

ⓐ m=9

ⓑ m=17

Answer

ⓐ no

ⓑ yes

2.3-151 §2.3 source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each given value is a solution to the equation.

3p+6=15

ⓐ p=3

ⓑ p=7

Answer

ⓐ yes

ⓑ no

2.3-153 §2.3 source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each given value is a solution to the equation.

18d−9=27

ⓐ d=1

ⓑ d=2

Answer

ⓐ no

ⓑ yes

2.3-155 §2.3 source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each given value is a solution to the equation.

8u−4=4u+40

ⓐ u=3

ⓑ u=11

Answer

ⓐ no

ⓑ yes

2.3-157 §2.3 source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each given value is a solution to the equation.

20h− 5= 15h+ 35

ⓐ h=6

ⓑ h=8

Answer

ⓐ no

ⓑ yes

2.3-159 §2.3 source ↗

Model the Subtraction Property of Equality

In the following exercises, write the equation modeled by the envelopes and counters and then solve using the subtraction property of equality.

The image is divided in half vertically. On the left side is an envelope with 2 counters below it. On the right side is 5 counters.The image is divided in half vertically. On the left side is an envelope with 2 counters below it. On the right side is 5 counters.

Answer

x + 2 = 5; x = 3

2.3-161 §2.3 source ↗

Model the Subtraction Property of Equality

In the following exercises, write the equation modeled by the envelopes and counters and then solve using the subtraction property of equality.

The image is divided in half vertically. On the left side is an envelope with three counters below it. On the right side is 6 counters.The image is divided in half vertically. On the left side is an envelope with three counters below it. On the right side is 6 counters.

Answer

x + 3 = 6; x = 3

2.3-163 §2.3 source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

a + 2 = 18

Answer

a = 16

2.3-165 §2.3 source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

p + 18 = 23

Answer

p = 5

2.3-167 §2.3 source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

r + 76 = 100

Answer

r = 24

2.3-169 §2.3 source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

16 = x + 9

Answer

x = 7

2.3-171 §2.3 source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

93 = p + 24

Answer

p = 69

2.3-173 §2.3 source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

465 = d + 398

Answer

d = 67

2.3-175 §2.3 source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

y − 3 = 19

Answer

y = 22

2.3-177 §2.3 source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

u − 6 = 24

Answer

u = 30

2.3-179 §2.3 source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

f − 55 = 123

Answer

f = 178

2.3-181 §2.3 source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

19 = n − 13

Answer

n = 32

2.3-183 §2.3 source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

10 = p − 38

Answer

p = 48

2.3-185 §2.3 source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

268 = y − 199

Answer

y = 467

2.3-187 §2.3 source ↗

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

The sum of 8 and 9 is equal to 17.

Answer

8 + 9 = 17

2.3-189 §2.3 source ↗

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

The difference of 23 and 19 is equal to 4.

Answer

23 − 19 = 4

2.3-191 §2.3 source ↗

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

The product of 3 and 9 is equal to 27.

Answer

3 ⋅ 9 = 27

2.3-193 §2.3 source ↗

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

The quotient of 54 and 6 is equal to 9.

Answer

54 ÷ 6 = 9

2.3-195 §2.3 source ↗

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

Twice the difference of n and 10 gives 52.

Answer

2(n − 10) = 52

2.3-197 §2.3 source ↗

Translate Word Phrase to Algebraic Equations

In the following exercises, translate the given sentence into an algebraic equation.

The sum of three times y and 10 is 100.

Answer

3y + 10 = 100

2.3-199 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

Five more than p is equal to 21.

Answer

p + 5 = 21; p = 16

2.3-201 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

The sum of r and 18 is 73.

Answer

r + 18 = 73; r = 55

2.3-203 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

The difference of d and 30 is equal to 52.

Answer

d − 30 = 52; d = 82

2.3-205 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

12 less than u is 89.

Answer

u − 12 = 89; u = 101

2.3-207 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

325 less than c gives 799.

Answer

c − 325 = 799; c = 1124

2.3-209 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

Insurance Vince’s car insurance has a $500 deductible. Find the amount the insurance company will pay, p, for an $1800 claim by solving the equation 500+p=1800.

Answer

$1300

2.3-211 §2.3 source ↗

Translate to an Equation and Solve

In the following exercises, translate the given sentence into an algebraic equation and then solve it.

Sale purchase Arthur bought a suit that was on sale for $120 off. He paid $340 for the suit. Find the original price, p, of the suit by solving the equation p−120=340.

Answer

$460

Be Prepared 2.10 §2.4 source ↗

Which of the following numbers are counting numbers (natural numbers)?
0,4,215
If you missed this problem, review Example 1.1.
Example 1.1 in the book ↗

Answer

4 and 215

Be Prepared 2.11 §2.4 source ↗

Find the sum of 3,5, and 7.
If you missed the problem, review Example 2.1.
Example 2.1 in the book ↗

Answer

15

Try It 2.79 §2.4 source ↗

Determine whether each number is a multiple of 2:

ⓐ 678

ⓑ 21,493

Answer

ⓐ yes

ⓑ no

Try It 2.80 §2.4 source ↗

Determine whether each number is a multiple of 2:

ⓐ 979

ⓑ 17,780

Answer

ⓐ no

ⓑ yes

Try It 2.81 §2.4 source ↗

Determine whether each number is a multiple of 5.

ⓐ 675

ⓑ 1,578

Answer

ⓐ yes

ⓑ no

Try It 2.82 §2.4 source ↗

Determine whether each number is a multiple of 5.

ⓐ 421

ⓑ 2,690

Answer

ⓐ no

ⓑ yes

Try It 2.83 §2.4 source ↗

Determine whether each number is a multiple of 10:

ⓐ 179

ⓑ 3,540

Answer

ⓐ no

ⓑ yes

Try It 2.84 §2.4 source ↗

Determine whether each number is a multiple of 10:

ⓐ 110

ⓑ 7,595

Answer

ⓐ yes

ⓑ no

Try It 2.85 §2.4 source ↗

Determine whether each number is a multiple of 3:

ⓐ 954

ⓑ 3,742

Answer

ⓐ yes

ⓑ no

Try It 2.86 §2.4 source ↗

Determine whether each number is a multiple of 3:

ⓐ 643

ⓑ 8,379

Answer

ⓐ no

ⓑ yes

Try It 2.87 §2.4 source ↗

Determine whether the given number is divisible by 2, 3, 5, and10.

6240

Answer

Divisible by 2, 3, 5, and 10

Try It 2.88 §2.4 source ↗

Determine whether the given number is divisible by 2, 3, 5, and10.

7248

Answer

Divisible by 2 and 3, not 5 or 10.

Try It 2.89 §2.4 source ↗

Determine whether the given number is divisible by2, 3, 5, and10.

4962

Answer

Divisible by 2 and 3, not 5 or 10.

Try It 2.90 §2.4 source ↗

Determine whether the given number is divisible by2, 3, 5, and10.

3765

Answer

Divisible by 3 and 5.

Try It 2.91 §2.4 source ↗

Find all the factors of the given number:

96

Answer

1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96

Try It 2.92 §2.4 source ↗

Find all the factors of the given number:

80

Answer

1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Try It 2.93 §2.4 source ↗

Identify the number as prime or composite:

91

Answer

composite

Try It 2.94 §2.4 source ↗

Identify the number as prime or composite:

137

Answer

prime

2.4-215 §2.4 source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for the given number.

2

Answer

2, 4, 6, 8, 10 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48

2.4-217 §2.4 source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for the given number.

4

Answer

4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48

2.4-219 §2.4 source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for the given number.

6

Answer

6, 12, 18, 24, 30, 36, 42, 48

2.4-221 §2.4 source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for the given number.

8

Answer

8, 16, 24, 32, 40, 48

2.4-223 §2.4 source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for the given number.

10

Answer

10, 20, 30, 40

2.4-225 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

84

Answer

Divisible by 2, 3, 4, 6

2.4-227 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

75

Answer

Divisible by 3, 5

2.4-229 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

168

Answer

Divisible by 2, 3, 4, 6

2.4-231 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

900

Answer

Divisible by 2, 3, 4, 5, 6, 10

2.4-233 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

896

Answer

Divisible by 2, 4

2.4-235 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

375

Answer

Divisible by 3, 5

2.4-237 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

350

Answer

Divisible by 2, 5, 10

2.4-239 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

1430

Answer

Divisible by 2, 5, 10

2.4-241 §2.4 source ↗

Use Common Divisibility Tests

In the following exercises, use the divisibility tests to determine whether each number is divisible by 2, 3, 4, 5, 6, and10.

22,335

Answer

Divisible by 3, 5

2.4-243 §2.4 source ↗

Find All the Factors of a Number

In the following exercises, find all the factors of the given number.

36

Answer

1, 2, 3, 4, 6, 9, 12, 18, 36

2.4-245 §2.4 source ↗

Find All the Factors of a Number

In the following exercises, find all the factors of the given number.

60

Answer

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

2.4-247 §2.4 source ↗

Find All the Factors of a Number

In the following exercises, find all the factors of the given number.

144

Answer

1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72,144

2.4-249 §2.4 source ↗

Find All the Factors of a Number

In the following exercises, find all the factors of the given number.

588

Answer

1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 49, 84, 98, 147, 196, 294, 588

2.4-251 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

43

Answer

prime

2.4-253 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

39

Answer

composite

2.4-255 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

71

Answer

prime

2.4-257 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

481

Answer

composite

2.4-259 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

209

Answer

composite

2.4-261 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

667

Answer

composite

2.4-263 §2.4 source ↗

Identify Prime and Composite Numbers

In the following exercises, determine if the given number is prime or composite.

Banking Frank’s grandmother gave him $100 at his high school graduation. Instead of spending it, Frank opened a bank account. Every week, he added $15 to the account. The table shows how much money Frank had put in the account by the end of each week. Complete the table by filling in the blanks.

Weeks after graduation Total number of dollars Frank put in the account Simplified Total
0 100 100
1 100+15 115
2 100+15⋅2 130
3 100+15⋅3
4 100+15⋅[]
5 100+[]
6
20
x

Answer


This table has nine rows and three columns. The first row is a header row that labels each column. The first column is labeled “Weeks after opening the account”, the second is labeled “Total number of dollars Gina put in the account”, and the last is labeled “Simplified Total”. Under the “Weeks after opening the account” column are the values: 0, 1, 2, 3, 4, 5, 6, 20, and the letter x. Under the “Total number of dollars Gina put in the account” column are the expressions: 75; 75 plus 20; 75 plus 20 times 2; 75 plus 20 times 3; 75 plus 20 times empty set of brackets; 75 plus empty set of brackets; the last three rows are blank. Under the “Simplified Total” column are the values: 75, 95, 115, the last six rows are blank.

Be Prepared 2.12 §2.5 source ↗

Is 810 divisible by 2, 3, 5, 6, or10?
If you missed this problem, review Example 2.44.
Example 2.44 in the book ↗

Answer

2 , 3 , 5 , 6 , 10

Be Prepared 2.13 §2.5 source ↗

Is 127 prime or composite?
If you missed this problem, review Example 2.47.
Example 2.47 in the book ↗

Answer

prime

Be Prepared 2.13 (b) §2.5 source ↗

Write 2⋅2⋅2⋅2 in exponential notation.
If you missed this problem, review Example 2.5.
Example 2.5 in the book ↗

Answer

2 4

Try It 2.95 §2.5 source ↗

Find the prime factorization using the factor tree method: 80

Answer

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 5, or 24 ⋅ 5

Try It 2.96 §2.5 source ↗

Find the prime factorization using the factor tree method: 60

Answer

2 ⋅ 2 ⋅ 3 ⋅ 5, or 22 ⋅ 3 ⋅ 5

Try It 2.97 §2.5 source ↗

Find the prime factorization using the factor tree method: 126

Answer

2 ⋅ 3 ⋅ 3 ⋅ 7, or 2 ⋅ 32 ⋅ 7

Try It 2.98 §2.5 source ↗

Find the prime factorization using the factor tree method: 294

Answer

2 ⋅ 3 ⋅ 7 ⋅ 7, or 2 ⋅ 3 ⋅ 72

Try It 2.99 §2.5 source ↗

Find the prime factorization using the ladder method: 80

Answer

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 5, or 24 ⋅ 5

Try It 2.100 §2.5 source ↗

Find the prime factorization using the ladder method: 60

Answer

2 ⋅ 2 ⋅ 3 ⋅ 5, or 22 ⋅ 3 ⋅ 5

Try It 2.101 §2.5 source ↗

Find the prime factorization using the ladder method. 126

Answer

2 ⋅ 3 ⋅ 3 ⋅ 7, or 2 ⋅ 32 ⋅ 7

Try It 2.102 §2.5 source ↗

Find the prime factorization using the ladder method. 294

Answer

2 ⋅ 3 ⋅ 7 ⋅ 7, or 2 ⋅ 3 ⋅ 72

Try It 2.103 §2.5 source ↗

Find the least common multiple (LCM) of the given numbers: 9and12

Answer

36

Try It 2.104 §2.5 source ↗

Find the least common multiple (LCM) of the given numbers: 18and24

Answer

72

Try It 2.105 §2.5 source ↗

Find the LCM using the prime factors method. 15and20

Answer

60

Try It 2.106 §2.5 source ↗

Find the LCM using the prime factors method. 15and35

Answer

105

Try It 2.107 §2.5 source ↗

Find the LCM using the prime factors method: 55,88

Answer

440

Try It 2.108 §2.5 source ↗

Find the LCM using the prime factors method: 60,72

Answer

360

2.5-267 §2.5 source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number using the factor tree method.

86

Answer

2 ⋅ 43

2.5-269 §2.5 source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number using the factor tree method.

132

Answer

2 ⋅ 2 ⋅ 3 ⋅ 11

2.5-271 §2.5 source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number using the factor tree method.

693

Answer

3 ⋅ 3 ⋅ 7 ⋅ 11

2.5-273 §2.5 source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number using the factor tree method.

115

Answer

5 ⋅ 23

2.5-275 §2.5 source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number using the factor tree method.

2475

Answer

3 ⋅ 3 ⋅ 5 ⋅ 5 ⋅ 11

2.5-277 §2.5 source ↗

In the following exercises, find the prime factorization of each number using the ladder method.

56

Answer

2 ⋅ 2 ⋅ 2 ⋅ 7

2.5-279 §2.5 source ↗

In the following exercises, find the prime factorization of each number using the ladder method.

168

Answer

2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 7

2.5-281 §2.5 source ↗

In the following exercises, find the prime factorization of each number using the ladder method.

391

Answer

17 ⋅ 23

2.5-283 §2.5 source ↗

In the following exercises, find the prime factorization of each number using the ladder method.

432

Answer

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 3 ⋅ 3

2.5-285 §2.5 source ↗

In the following exercises, find the prime factorization of each number using the ladder method.

2160

Answer

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 3 ⋅ 3 ⋅ 5

2.5-287 §2.5 source ↗

In the following exercises, find the prime factorization of each number using any method.

150

Answer

2 ⋅ 3 ⋅ 5 ⋅ 5

2.5-289 §2.5 source ↗

In the following exercises, find the prime factorization of each number using any method.

525

Answer

3 ⋅ 5 ⋅ 5 ⋅ 7

2.5-291 §2.5 source ↗

In the following exercises, find the prime factorization of each number using any method.

36

Answer

2 ⋅ 2 ⋅ 3 ⋅ 3

2.5-293 §2.5 source ↗

In the following exercises, find the prime factorization of each number using any method.

350

Answer

2 ⋅ 5 ⋅ 5 ⋅ 7

2.5-295 §2.5 source ↗

Find the Least Common Multiple (LCM) of Two Numbers

In the following exercises, find the least common multiple (LCM) by listing multiples.

8 , 12

Answer

24

2.5-297 §2.5 source ↗

Find the Least Common Multiple (LCM) of Two Numbers

In the following exercises, find the least common multiple (LCM) by listing multiples.

6 , 15

Answer

30

2.5-299 §2.5 source ↗

Find the Least Common Multiple (LCM) of Two Numbers

In the following exercises, find the least common multiple (LCM) by listing multiples.

30 , 40

Answer

120

2.5-301 §2.5 source ↗

Find the Least Common Multiple (LCM) of Two Numbers

In the following exercises, find the least common multiple (LCM) by listing multiples.

60 , 75

Answer

300

2.5-303 §2.5 source ↗

In the following exercises, find the least common multiple (LCM) by using the prime factors method.

8 , 12

Answer

24

2.5-305 §2.5 source ↗

In the following exercises, find the least common multiple (LCM) by using the prime factors method.

24 , 30

Answer

120

2.5-307 §2.5 source ↗

In the following exercises, find the least common multiple (LCM) by using the prime factors method.

70 , 84

Answer

420

2.5-309 §2.5 source ↗

In the following exercises, find the least common multiple (LCM) using any method.

6 , 21

Answer

42

2.5-311 §2.5 source ↗

In the following exercises, find the least common multiple (LCM) using any method.

24 , 30

Answer

120

2.5-313 §2.5 source ↗

In the following exercises, find the least common multiple (LCM) using any method.

Grocery shopping Hot dogs are sold in packages of ten, but hot dog buns come in packs of eight. What is the smallest number of hot dogs and buns that can be purchased if you want to have the same number of hot dogs and buns? (Hint: it is the LCM!)

Answer

40

2.R-317 §2.R source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebra to English.

3 ⋅ 8

Answer

3 times 8, the product of three and eight.

2.R-319 §2.R source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebra to English.

24 ÷ 6

Answer

24 divided by 6, the quotient of twenty-four and six.

2.R-321 §2.R source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebra to English.

50 ≥ 47

Answer

50 is greater than or equal to 47

2.R-323 §2.R source ↗

Use Variables and Algebraic Symbols

In the following exercises, translate from algebra to English.

n + 4 = 13

Answer

The sum of n and 4 is equal to 13

2.R-325 §2.R source ↗

Identify Expressions and Equations

In the following exercises, determine if each is an expression or equation.

5 + u = 84

Answer

equation

2.R-327 §2.R source ↗

Identify Expressions and Equations

In the following exercises, determine if each is an expression or equation.

4 y − 11

Answer

expression

2.R-329 §2.R source ↗

Simplify Expressions with Exponents

In the following exercises, write in exponential form.

2 ⋅ 2 ⋅ 2

Answer

23

2.R-331 §2.R source ↗

Simplify Expressions with Exponents

In the following exercises, write in exponential form.

x ⋅ x ⋅ x ⋅ x ⋅ x ⋅ x

Answer

x 6

2.R-333 §2.R source ↗

In the following exercises, write in expanded form.

8 4

Answer

8 ⋅ 8 ⋅ 8 ⋅ 8

2.R-335 §2.R source ↗

In the following exercises, write in expanded form.

y 5

Answer

y ⋅ y ⋅ y ⋅ y ⋅ y

2.R-337 §2.R source ↗

In the following exercises, simplify each expression.

3 4

Answer

81

2.R-339 §2.R source ↗

In the following exercises, simplify each expression.

2 7

Answer

128

2.R-341 §2.R source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

10 + 2 ⋅ 5

Answer

20

2.R-343 §2.R source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

( 30 + 6 ) ÷ 2

Answer

18

2.R-345 §2.R source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

7 2 + 5 2

Answer

74

2.R-347 §2.R source ↗

Simplify Expressions Using the Order of Operations

In the following exercises, simplify.

4 + 3 ( 10 − 1 )

Answer

31

2.R-349 §2.R source ↗

Evaluate an Expression

In the following exercises, evaluate the following expressions.

9 x − 5 when x = 7

Answer

58

2.R-351 §2.R source ↗

Evaluate an Expression

In the following exercises, evaluate the following expressions.

3a− 4bwhena= 10, b= 1

Answer

26

2.R-353 §2.R source ↗

Identify Terms, Coefficients and Like Terms

In the following exercises, identify the terms in each expression.

12 n 2 + 3 n + 1

Answer

12n2,3n, 1

2.R-355 §2.R source ↗

In the following exercises, identify the coefficient of each term.

6 y

Answer

6

2.R-357 §2.R source ↗

In the following exercises, identify the like terms.

5 x 2 , 3, 5 y 2 , 3x, x, 4

Answer

3 and 4; 3x and x

2.R-359 §2.R source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the following expressions by combining like terms.

15 a + 9 a

Answer

24a

2.R-361 §2.R source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the following expressions by combining like terms.

4 x + 7 x + 3 x

Answer

14x

2.R-363 §2.R source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the following expressions by combining like terms.

8 n + 2 + 4 n + 9

Answer

12n + 11

2.R-365 §2.R source ↗

Simplify Expressions by Combining Like Terms

In the following exercises, simplify the following expressions by combining like terms.

7 y 2 + 2y+ 11+ 3 y 2 − 8

Answer

10y2 + 2y + 3

2.R-367 §2.R source ↗

Translate English Phrases to Algebraic Expressions

In the following exercises, translate the following phrases into algebraic expressions.

the difference of x and 6

Answer

x − 6

2.R-369 §2.R source ↗

Translate English Phrases to Algebraic Expressions

In the following exercises, translate the following phrases into algebraic expressions.

the product of 3n and 9

Answer

3n ⋅ 9

2.R-371 §2.R source ↗

Translate English Phrases to Algebraic Expressions

In the following exercises, translate the following phrases into algebraic expressions.

5 times the sum of y and 1

Answer

5(y + 1)

2.R-373 §2.R source ↗

Translate English Phrases to Algebraic Expressions

In the following exercises, translate the following phrases into algebraic expressions.

Jack bought a sandwich and a coffee. The cost of the sandwich was $3 more than the cost of the coffee. Call the cost of the coffee c. Write an expression for the cost of the sandwich.

Answer

c + 3

2.R-375 §2.R source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each number is a solution to the equation.

y+16=40

ⓐ 24

ⓑ 56

Answer

ⓐ yes

ⓑ no

2.R-377 §2.R source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each number is a solution to the equation.

4n+12=36

ⓐ 6

ⓑ 12

Answer

ⓐ yes

ⓑ no

2.R-379 §2.R source ↗

Determine Whether a Number is a Solution of an Equation

In the following exercises, determine whether each number is a solution to the equation.

15x− 5= 10x+ 45

ⓐ 2

ⓑ 10

Answer

ⓐ no

ⓑ yes

2.R-381 §2.R source ↗

Model the Subtraction Property of Equality

In the following exercises, write the equation modeled by the envelopes and counters and then solve the equation using the subtraction property of equality.

This image is divided into two parts: the first part shows an envelope and 3 blue counters and the next to it, the second part shows five counters.This image is divided into two parts: the first part shows an envelope and 3 blue counters and the next to it, the second part shows five counters.

Answer

x + 3 = 5; x = 2

2.R-383 §2.R source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

c + 8 = 14

Answer

c = 6

2.R-385 §2.R source ↗

Solve Equations using the Subtraction Property of Equality

In the following exercises, solve each equation using the subtraction property of equality.

23 = x + 12

Answer

x = 11

2.R-387 §2.R source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

y − 7 = 16

Answer

y = 23

2.R-389 §2.R source ↗

Solve Equations using the Addition Property of Equality

In the following exercises, solve each equation using the addition property of equality.

19 = p − 15

Answer

p = 34

2.R-391 §2.R source ↗

Translate English Sentences to Algebraic Equations

In the following exercises, translate each English sentence into an algebraic equation.

The sum of 7 and 33 is equal to 40.

Answer

7 + 33 = 40

2.R-393 §2.R source ↗

Translate English Sentences to Algebraic Equations

In the following exercises, translate each English sentence into an algebraic equation.

The product of 4 and 8 is equal to 32.

Answer

4 ⋅ 8 = 32

2.R-395 §2.R source ↗

Translate English Sentences to Algebraic Equations

In the following exercises, translate each English sentence into an algebraic equation.

Twice the difference of n and 3 gives 76.

Answer

2(n − 3) = 76

2.R-397 §2.R source ↗

Translate to an Equation and Solve

In the following exercises, translate each English sentence into an algebraic equation and then solve it.

Eight more than x is equal to 35.

Answer

x + 8 = 35; x = 27

2.R-399 §2.R source ↗

Translate to an Equation and Solve

In the following exercises, translate each English sentence into an algebraic equation and then solve it.

The difference of q and 18 is 57.

Answer

q − 18 = 57; q = 75

2.R-401 §2.R source ↗

Mixed Practice

In the following exercises, solve each equation.

h − 15 = 27

Answer

h = 42

2.R-403 §2.R source ↗

Mixed Practice

In the following exercises, solve each equation.

z + 52 = 85

Answer

z = 33

2.R-405 §2.R source ↗

Mixed Practice

In the following exercises, solve each equation.

27 = q + 19

Answer

q = 8

2.R-407 §2.R source ↗

Mixed Practice

In the following exercises, solve each equation.

31 = v − 25

Answer

v = 56

2.R-409 §2.R source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for each of the following.

3

Answer

3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48

2.R-411 §2.R source ↗

Identify Multiples of Numbers

In the following exercises, list all the multiples less than 50 for each of the following.

8

Answer

8, 16, 24, 32, 40, 48

2.R-413 §2.R source ↗

Use Common Divisibility Tests

In the following exercises, using the divisibility tests, determine whether each number is divisible by 2, by3, by5, by6, and by10.

96

Answer

2, 3, 6

2.R-415 §2.R source ↗

Use Common Divisibility Tests

In the following exercises, using the divisibility tests, determine whether each number is divisible by 2, by3, by5, by6, and by10.

420

Answer

2, 3, 5, 6, 10

2.R-417 §2.R source ↗

Find All the Factors of a Number

In the following exercises, find all the factors of each number.

30

Answer

1, 2, 3, 5, 6, 10, 15, 30

2.R-419 §2.R source ↗

Find All the Factors of a Number

In the following exercises, find all the factors of each number.

180

Answer

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180

2.R-421 §2.R source ↗

Identify Prime and Composite Numbers

In the following exercises, identify each number as prime or composite.

19

Answer

prime

2.R-423 §2.R source ↗

Identify Prime and Composite Numbers

In the following exercises, identify each number as prime or composite.

121

Answer

composite

2.R-425 §2.R source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number.

84

Answer

2 ⋅ 2 ⋅ 3 ⋅ 7

2.R-427 §2.R source ↗

Find the Prime Factorization of a Composite Number

In the following exercises, find the prime factorization of each number.

350

Answer

2 ⋅ 5 ⋅ 5 ⋅ 7

2.R-429 §2.R source ↗

Find the Least Common Multiple of Two Numbers

In the following exercises, find the least common multiple of each pair of numbers.

9 , 15

Answer

45

2.R-431 §2.R source ↗

Find the Least Common Multiple of Two Numbers

In the following exercises, find the least common multiple of each pair of numbers.

25 , 35

Answer

175

2.R-433 §2.R source ↗

Find the Least Common Multiple of Two Numbers

In the following exercises, find the least common multiple of each pair of numbers.

Describe how you have used two topics from The Language of Algebra chapter in your life outside of your math class during the past month.

Answer

Answers will vary

2.T-435 §2.T source ↗

In the following exercises, translate from an algebraic equation to English phrases.

15 − x

Answer

15 minus x, the difference of fifteen and x.

2.T-437 §2.T source ↗

In the following exercises, identify each as an expression or equation.

x + 6 = 9

Answer

equation

2.T-439 §2.T source ↗

In the following exercises, identify each as an expression or equation.

ⓐ Write n⋅n⋅n⋅n⋅n⋅n in exponential form.

ⓑ Write 35 in expanded form and then simplify.

Answer

ⓐ n6

ⓑ 3 ⋅ 3 ⋅ 3 ⋅ 3 ⋅ 3 = 243

2.T-441 §2.T source ↗

In the following exercises, simplify, using the order of operations.

( 8 + 1 ) ⋅ 4

Answer

36

2.T-443 §2.T source ↗

In the following exercises, simplify, using the order of operations.

( 8 + 4 ) ÷ 3 + 1

Answer

5

2.T-445 §2.T source ↗

In the following exercises, simplify, using the order of operations.

5 [ 2 + 7 ( 9 − 8 ) ]

Answer

45

2.T-447 §2.T source ↗

In the following exercises, evaluate each expression.

y 3 when y = 5

Answer

125

2.T-449 §2.T source ↗

In the following exercises, evaluate each expression.

hwwhenh= 12, w= 3

Answer

36

2.T-451 §2.T source ↗

In the following exercises, translate each phrase into an algebraic expression.

5 more than x

Answer

x + 5

2.T-453 §2.T source ↗

In the following exercises, translate each phrase into an algebraic expression.

three times the difference of aandb

Answer

3(a − b)

2.T-455 §2.T source ↗

In the following exercises, solve each equation.

n − 6 = 25

Answer

n = 31

2.T-457 §2.T source ↗

In the following exercises, translate each English sentence into an algebraic equation and then solve it.

15 less than y is 32.

Answer

y − 15 = 32; y = 47

2.T-459 §2.T source ↗

In the following exercises, translate each English sentence into an algebraic equation and then solve it.

List all the multiples of 4 that are less than 50.

Answer

4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48

2.T-461 §2.T source ↗

In the following exercises, translate each English sentence into an algebraic equation and then solve it.

Find the prime factorization of 1080.

Answer

23 ⋅ 33 ⋅ 5

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Problems and answers are adapted from Prealgebra 2e by Lynn Marecek, MaryAnne Anthony-Smith and Andrea Honeycutt Mathis, OpenStax, and are used under the CC BY-NC-SA 4.0 licence. Access for free at https://openstax.org/books/prealgebra-2e/pages/1-introduction. Illustrations: Copyright Rice University, OpenStax, under CC BY-NC-SA 4.0 license. This adaptation is released under the same licence, is non-commercial, and is neither affiliated with nor endorsed by OpenStax or Rice University.