Basic Mathematics for College Students

93.

95.32%, 43%, 13%, 6%, 6%;

103.18.17 105.5.001 107.0.008

1.1970–1975, about a 75% increase

2.2000–2005, about a 15% decrease

1.commission 3. a.increase b.original 5.purchase

price 7.sales 9. a.$64.07 b.$135.00 11.subtract,

original 13.$3.71 15.$4.20 17.$70.83 19.$64.03

21.5.2% 23.15.3% 25.$11.40 27.$168 29.2%

31.4% 33.10% 35.15% 37.20% 39.10%

41.$29.70, $60.30 43.$8.70, $49.30 45.19% 47.14%

49.$53.55 51.$47.34, $2.84, $50.18 53.8% 55.0.25%

57.$150 59.8%, 3.75%, 1.2%, 6.2% 61.5% 63.31%

65.152% 67.36% 69.12.5% 71. a.25% b.36%

73.$2,955 75.1.5% 77.90% 79.$12,000

81. a.$7.99 b.$31.96 83.6% 85.$349.97, 13%
    87.23%, $11.88 89.$76.50 91.$187.49 97.


82. 3 101. 13

1.Estimation 3.two 5. 2 7. 4 9.10, 5 11.2.751, 3

13.0.1267, 0.1 15.405.9 lb, 400 lb 17.69.14 min, 70 min

19. 70 21. 14 23.2,100,000 25.200,000 27. 4 29. 12


20. 820 33. 20 35.$9 37.$4.50 39.$18 41.$1.50


21. 8 45. 72 47. 12 49.5.4 51. 180 53. 230 55. 6


22. 18 59. 7 61. 70 63.12,000 65.1.8 67.0.49


23. 12 71.164 students 73.$60 75.$6 77.$7.50
    79.$30,000 81.320 lb 83.210 motorists 85.220 people
    87.18,000 people 89.3,100 volunteers


24. a. b. c. d. 1
    2
    3

5

3

5

12

1

3

1

1

3

4

3

Study Set Section 6.4 (page 557)

 50

Study Set Section 6.3 (page 546)

Think It Through (page 543)

Personal

income

taxes

43%

Corporate

income taxes

13%

Excise, estate,

customs taxes

6%

Borrowing 6%

Social Security,

Medicare,

unemployment

taxes

32%

2007 Federal Income Sources

Renewable 10%

Nuclear

12%

Coal 32%

Natural gas

32%

Petroleum 14%

1.interest 3.rate 5.total 7. a.$125,000 b.5%

c.30 years 9. a.0.07 b.0.098 c.0.0625 11.$1,800

13. a.compound interest b.$1,000 c. 4 d.$50
    e.1 year 15.I Prt 17.$100 19.$252
    21.$525 23.$1,590 25.$16.50 27.$30.80
    29.$13,159.23 31.$40,493.15 33.$2,060.68
    35.$5,619.27 37.$10,011.96 39.$77,775.64 41.$5,300
    43.$198 45.$5,580 47.$46.88 49.$4,262.14
    51.$10,000, % 0.0725, 2 yr, $1,450 53.$192, $1,392, $58
    55.$19.449 million 57.$755.83 59.$1,271.22
    61.$570.65 63.$30,915.66 65.$159,569.75


14. 
    
    
    
    73. 
        
        
        
        75. 77. 36
        
        
        
        
    
    
    
    

1.39%, 0.39, 2.111%, 1.11, 3.61% 4. a.54%

b.46% 5. 6. 7. 8. 9.0.27 10.0.08

11.6.55 12.0.018 13.0.0075 14.0.0023 15.83%

16.162.5% 17.5.1% 18.600% 19.50% 20.80%

21.87.5% 22.6.25% 23. %33.3% 24. %83.3%

25. %91.7% 26. %166.7% 27. a.0.972

b. 28.63% 29. a.0.0025 b. 30. %6.7%

31. a.amount: 15, base: 45 percent: %b.Amount, base,

percent 32. a.0.13 b.0.071 c.1.95 d.0.0025

e. f. g. 33. a.x 32% 96 b. 64   x 135

c. 9     47.2%x 34. a. b.

c. 35. 200 36. 125 37.1.75% 38.2,100

39. 121 40. 30 41. 600 42.5,300% 43.0.6 gal methane


40. 68 45.87% 46.$5.43


41. 48.139,531,200 mi^2
    49.$3.30, $63.29
    50.4% 51.$40.20
    52.4.25% 53.$100,000
    54.original 55.18%
    56.9.6%
    57. a.purchase price
    b.sales tax
    c.commission rate
    58. a.sale price
    b.original price
    c.discount
    59.$180, $2,500, 7.2% 60.5% 61.3.4203, 3
    62.86.87, 90 63.4.34 sec, 4 sec 64.1,090 L, 1,000 L


42. 12 66. 120 67.140,000 68. 150 69. 3 70. 10


43. 350 72.1,000 73. 60 74. 2 75.$36 76.$7.50
    77.about 12 fluid oz 78.about 120 people 79. 200

College

Local bank 57%

18%

Internet

15%

Other 5%

Family/friends

5%

9

x

47.2

100

64

135

x

100

x

96

32

100

1

6

2

3

1

3

33

1

3

6

2

3

1

400

243

250

166

2

3

91

2

3

83

1

3

33

1

3

1

500

37

400

6

5

3

20

111

100

39

100

Chapter 6 Review (page 570)

8

1

3

29

35

1

2

7

1

4

Study Set Section 6.5 (page 566)

A-46 Appendix V Answers to Selected Exercises