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Prealgebra 2e

# Chapter 2

Prealgebra 2eChapter 2

### Be Prepared

2.1

$112112$

2.2

$180,096180,096$

2.3

$807807$

2.4

expression

2.5

$1,0241,024$

2.6

$7373$

2.7

$1919$

2.8

$4242$

2.9

$x−8x−8$

2.10

$44$ and $215215$

2.11

$1515$

2.12

$2,3,5,6,102,3,5,6,10$

2.13

prime

2.13

$2424$

### Try It

2.1
1. 18 plus 11; the sum of eighteen and eleven
2. 27 times 9; the product of twenty-seven and nine
3. 84 divided by 7; the quotient of eighty-four and seven
4. p minus q; the difference of p and q
2.2
1. 47 minus 19; the difference of forty-seven and nineteen
2. 72 divided by 9; the quotient of seventy-two and nine
3. m plus n; the sum of m and n
4. 13 times 7; the product of thirteen and seven
2.3
1. fourteen is less than or equal to twenty-seven
2. nineteen minus two is not equal to eight
3. twelve is greater than four divided by two
4. x minus seven is less than one
2.4
1. nineteen is greater than or equal to fifteen
2. seven is equal to twelve minus five
3. fifteen divided by three is less than eight
4. y minus three is greater than six
2.5
1. >
2. <
2.6
1. <
2. >
2.7
1. equation
2. expression
2.8
1. expression
2. equation
2.9

415

2.10

79

2.11
1. 4 · 4 · 4 · 4 · 4 · 4 · 4 · 4
2. a · a · a · a · a · a · a
2.12
1. 8 · 8 · 8 · 8 · 8 · 8 · 8 · 8
2. b · b · b · b · b · b
2.13
1. 125
2. 1
2.14
1. 49
2. 0
2.15
1. 2
2. 14
2.16
1. 35
2. 99
2.17

18

2.18

9

2.19

16

2.20

23

2.21

86

2.22

1

2.23

81

2.24

75

2.25
1. 10
2. 19
2.26
1. 4
2. 12
2.27
1. 13
2. 5
2.28
1. 8
2. 16
2.29

64

2.30

216

2.31

64

2.32

81

2.33

33

2.34

10

2.35

40

2.36

9

2.37

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

2.38

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

2.39

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

2.40

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

2.41

16x + 17

2.42

17y + 7

2.43

4x2 + 14x

2.44

12y2 + 15y

2.45
1. 47 − 41
2. 5x ÷ 2
2.46
1. 17 + 19
2. 7x
2.47
1. x + 11
2. 11a − 14
2.48
1. j + 19
2. 2x − 21
2.49
1. 4(p + q)
2. 4p + q
2.50
1. 2x − 8
2. 2(x − 8)
2.51

w − 5

2.52

l + 2

2.53

6q − 7

2.54

4n + 8

2.55

no

2.56

yes

2.57

yes

2.58

yes

2.59

x + 1 = 7; x = 6

2.60

x + 3 = 4; x = 1

2.61

x = 13

2.62

x = 5

2.63

y = 28

2.64

y = 46

2.65

x = 22

2.66

y = 4

2.67

a = 37

2.68

n = 41

2.69

7 + 6 = 13

2.70

8 + 6 = 14

2.71

6 ⋅ 9 = 54

2.72

21 ⋅ 3 = 63

2.73

2(x − 5) = 30

2.74

2(y − 4) = 16

2.75

x + 7 = 37; x = 30

2.76

y + 11 = 28; y = 17

2.77

z − 17 = 37; z = 54

2.78

x − 19 = 45; x = 64

2.79
1. yes
2. no
2.80
1. no
2. yes
2.81
1. yes
2. no
2.82
1. no
2. yes
2.83
1. no
2. yes
2.84
1. yes
2. no
2.85
1. yes
2. no
2.86
1. no
2. yes
2.87

Divisible by 2, 3, 5, and 10

2.88

Divisible by 2 and 3, not 5 or 10.

2.89

Divisible by 2, 3, not 5 or 10.

2.90

Divisible by 3 and 5.

2.91

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

2.92

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

2.93

composite

2.94

prime

2.95

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 5, or 24 ⋅ 5

2.96

2 ⋅ 2 ⋅ 3 ⋅ 5, or 22 ⋅ 3 ⋅ 5

2.97

2 ⋅ 3 ⋅ 3 ⋅ 7, or 2 ⋅ 32 ⋅ 7

2.98

2 ⋅ 3 ⋅ 7 ⋅ 7, or 2 ⋅ 3 ⋅ 72

2.99

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 5, or 24 ⋅ 5

2.100

2 ⋅ 2 ⋅ 3 ⋅ 5, or 22 ⋅ 3 ⋅ 5

2.101

2 ⋅ 3 ⋅ 3 ⋅ 7, or 2 ⋅ 32 ⋅ 7

2.102

2 ⋅ 3 ⋅ 7 ⋅ 7, or 2 ⋅ 3 ⋅ 72

2.103

36

2.104

72

2.105

60

2.106

105

2.107

440

2.108

360

### Section 2.1 Exercises

1.

16 minus 9, the difference of sixteen and nine

3.

5 times 6, the product of five and six

5.

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

7.

x plus 8, the sum of x and eight

9.

2 times 7, the product of two and seven

11.

fourteen is less than twenty-one

13.

thirty-six is greater than or equal to nineteen

15.

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

17.

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

19.

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

21.

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

23.

equation

25.

expression

27.

expression

29.

equation

31.

37

33.

x5

35.

5x5x5

37.

2x2x2x2x2x2x2x2

39.
1. 43
2. 55
41.

5

43.

34

45.

58

47.

6

49.

13

51.

4

53.

35

55.

10

57.

41

59.

81

61.

149

63.

50

### Section 2.2 Exercises

69.

22

71.

26

73.

144

75.

32

77.

27

79.

21

81.

41

83.

9

84.

225

85.

73

87.

54

89.

15x2, 6x, 2

91.

10y3, y, 2

93.

8

95.

5

97.

x3 and 8x3; 14 and 5

99.

16ab and 4ab; 16b2 and 9b2

101.

13x

103.

26a

105.

7c

107.

12x + 8

109.

10u + 3

111.

12p + 10

113.

22a + 1

115.

17x2 + 20x + 16

117.

8 + 12

119.

14 − 9

121.

9 ⋅ 7

123.

36 ÷ 9

125.

x − 4

127.

6y

129.

8x + 3x

131.

y ÷ 3

133.

8 (y − 9)

135.

5 (x + y)

137.

b + 15

139.

b − 4

141.

2n − 7

143.

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

### Section 2.3 Exercises

147.
1. yes
2. no
149.
1. no
2. yes
151.
1. yes
2. no
153.
1. no
2. yes
155.
1. no
2. yes
157.
1. no
2. yes
159.

x + 2 = 5; x = 3

161.

x + 3 = 6; x = 3

163.

a = 16

165.

p = 5

167.

r = 24

169.

x = 7

171.

p = 69

173.

d = 67

175.

y = 22

177.

u = 30

179.

f = 178

181.

n = 32

183.

p = 48

185.

y = 467

187.

8 + 9 = 17

189.

23 − 19 = 4

191.

3 ⋅ 9 = 27

193.

54 ÷ 6 = 9

195.

2(n − 10) = 52

197.

3y + 10 = 100

199.

p + 5 = 21; p = 16

201.

r + 18 = 73; r = 55

203.

d − 30 = 52; d = 82

205.

u − 12 = 89; u = 101

207.

c − 325 = 799; c = 1124

209.

$1300 211.$460

### Section 2.4 Exercises

215.

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

217.

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

219.

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

221.

8, 16, 24, 32, 40, 48

223.

10, 20, 30, 40

225.

Divisible by 2, 3, 4, 6

227.

Divisible by 3, 5

229.

Divisible by 2, 3, 4, 6

231.

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

233.

Divisible by 2, 4

235.

Divisible by 3, 5

237.

Divisible by 2, 5, 10

239.

Divisible by 2, 5, 10

241.

Divisible by 3, 5

243.

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

245.

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

247.

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

249.

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

251.

prime

253.

composite

255.

prime

257.

composite

259.

composite

261.

composite

263. ### Section 2.5 Exercises

267.

2 ⋅ 43

269.

2 ⋅ 2 ⋅ 3 ⋅ 11

271.

3 ⋅ 3 ⋅ 7 ⋅ 11

273.

5 ⋅ 23

275.

3 ⋅ 3 ⋅ 5 ⋅ 5 ⋅ 11

277.

2 ⋅ 2 ⋅ 2 ⋅ 7

279.

2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 7

281.

17 ⋅ 23

283.

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 3 ⋅ 3

285.

2 ⋅ 2 ⋅ 2 ⋅ 2 ⋅ 3 ⋅ 3 ⋅ 3 ⋅ 5

287.

2 ⋅ 3 ⋅ 5 ⋅ 5

289.

3 ⋅ 5 ⋅ 5 ⋅ 7

291.

2 ⋅ 2 ⋅ 3 ⋅ 3

293.

2 ⋅ 5 ⋅ 5 ⋅ 7

295.

24

297.

30

299.

120

301.

300

303.

24

305.

120

307.

420

309.

42

311.

120

313.

40

### Review Exercises

317.

3 times 8, the product of three and eight.

319.

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

321.

50 is greater than or equal to 47

323.

The sum of n and 4 is equal to 13

325.

equation

327.

expression

329.

23

331.

x6

333.

8 ⋅ 8 ⋅ 8 ⋅ 8

335.

yyyyy

337.

81

339.

128

341.

20

343.

18

345.

74

347.

31

349.

58

351.

26

353.

12n2,3n, 1

355.

6

357.

3 and 4; 3x and x

359.

24a

361.

14x

363.

12n + 11

365.

10y2 + 2y + 3

367.

x − 6

369.

3n ⋅ 9

371.

5(y + 1)

373.

c + 3

375.
1. yes
2. no
377.
1. yes
2. no
379.
1. no
2. yes
381.

x + 3 = 5; x = 2

383.

c = 6

385.

x = 11

387.

y = 23

389.

p = 34

391.

7 + 33 = 40

393.

4 ⋅ 8 = 32

395.

2(n − 3) = 76

397.

x + 8 = 35; x = 27

399.

q − 18 = 57; q = 75

401.

h = 42

403.

z = 33

405.

q = 8

407.

v = 56

409.

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

411.

8, 16, 24, 32, 40, 48

413.

2, 3, 6

415.

2, 3, 5, 6, 10

417.

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

419.

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

421.

prime

423.

composite

425.

2 ⋅ 2 ⋅ 3 ⋅ 7

427.

2 ⋅ 5 ⋅ 5 ⋅ 7

429.

45

431.

175

433.

Answers will vary

### Practice Test

435.

15 minus x, the difference of fifteen and x.

437.

equation

439.
1. n6
2. 3 ⋅ 3 ⋅ 3 ⋅ 3 ⋅ 3 = 243
441.

36

443.

5

445.

45

447.

125

449.

36

451.

x + 5

453.

3(ab)

455.

n = 31

457.

y − 15 = 32; y = 47

459.

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

461.

23 ⋅ 33 ⋅ 5

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