Basic Mathematics for College Students

41. a.82.5 b. 83 43. a.2,670 mi b.89 mi


42. a.$11,875 b. 125 c.$95 47. a.65¢ b.60¢
    c.50¢ 49.61° 51.2.23 GPA 53.2.5 GPA 55.median
    and mode are 85 57.same average (56); sister’s scores are
    more consistent 59.22.525 oz, 25 oz 61.6.8, 6.9
    63.5 lb, 4 lb 69.65% 71. 42 73.62.5% 75.43.5


43. a.18° b.71° 2. a.30 mph b.15 mph 3. 20
    4.about 59 5.Germany and India; about 17 6.about 35
    7.about 29% 8.men; about 15% more 9.women
    10.No, I would not date a co-worker (31% to 29%)
    11.about 4,100 animals 12.the Columbus Zoo; about
    7,250 animals 13.about 3,000 animals 14.about
    12,500 animals 15.oxygen 16.4% 17.13.5 lb
    18.166 lb 19.about 3,000 million eggs 20.about
    3,050 million eggs 21.2007; about 2,950 million eggs
    22.about 5,750 million eggs 23.between 2006 and 2007
    24.between 2007 and 2008 25.about 290 million more
    eggs 26.about 500 million more eggs 27. 60 28. 180


44. 160


45. 
    

31.yes 32.median 33.1.2 oz 34.1.138 oz

35.7.3 microns, 7.2 microns, 6.9 microns 36.32 pages

per day 37.$20 38.2.62 GPA

1. a.axis b.mean c.median d.mode e.central


2. a.563 calories b.129 calories c.about 8 mph


3. a.love seat; 130 ft b. 50 feet more c.340 ft 4. a.75%
   b.14.1% c.lung cancer d.prostate cancer; 32.7%


4. a.about 38 g b.about 15 g 6. a.17% b.529,550


5. a.about 27,000 police officers b.1989; about 26,000
   police officers c. 2000; about 41,000 police officers
   d.about 5,000 police officers 8. a.bicyclist 1
   b.Bicyclist 1 is stopped, but is ahead in the race. Bicyclist 2 is
   beginning to catch up. c.time C d.Bicyclist 2 never lead.
   e.bicyclist 1 9. a.22 employees b.30 employees
   c.57 employees 10. a.7.5 hr b.7.5 hr c.5 hr
   11.3 stars 12.3.36 GPA 13.mean: 4.41 million; median:
   4.25 million; mode: 4.25 million 14.Of all the existing
   single-family homes sold in May of 2009, half of them sold for
   less than $172,900 and half sold for more than $172,900.

Chapter 7 Test (page 630)

3.0 8.0 13.0 18.0 23.0

Hours of TV watched by the household

Frequency

10

30

50

70

90

110

Chapter 7 Review (page 621)

1.Fifty-two million, nine hundred forty thousand,

five hundred fifty-nine; 50,000,000 2,000,000 900,000 

40,000  500  50  9 2.50,000 3.54,604 4.4,209

5.23,115 6. 87 7. 683  459 1,142 8.10,912 in.^2

9. 2011 10. a.1, 2, 3, 6, 9, 18 b. 11.2, 3, 5, 7, 11,
   13, 17, 19, 23, 29 12. a. 24 b. 4 13. 35 14. 9


10. 
    


11. a. 6 b. 5 c.false 17. a. 20 b. 30 c. 125
    d. 5 18.1,100°F 19. 5 20. 429 21. 4 22. 200


12. a. b. 24. a. 0 b.undefined 25. 26.


13. 
    
    
    
    28. 29.160 min 30.
    
    
    
    


14. in. 32. 33. 34.428.91 35.$1,815.19


15. a. 345 b.0.000345 37.145.5 38.0.744 39. 745
    40.0.01825 41. 42. 75 43. 44.$59.95 45.

46.128 fl oz 47.6.4 m 48.19.8°C 49. , 0.03, 2.25,

225%, , 4.1% 50.17% 51.24.36 52.57.6

53.$7.92 54.16% 55.$12 56.$3,312 57.$13,159.23

58. a.7% b.5,040 59. a.2008; 36 b.2007 to 2008;
    an increase of 16 deaths c.2008 to 2009; a decrease of
    8 deaths 60.mean: 3.02; median: 3.00; mode: 2.75

1.Variables 3.expressions 5.terms 7.coefficient

9. in. 11. a. ouncesb.(100p) lb
   13.5, 25, 45 15. 17. 19. a.xy yx
   b.(rs)t r(st) 21. 0 s 0 and s 0 0


10. a. 4 b.3, 11, , 9 25.6,75, 1, , , 1 27.term
    29.factor 31. 33. 35. 37.


11. 
    
    
    
    41. 
        
        
        
        43. 
            
            
            
            45. 
                
            
            
            
            
        
        
        
        
    
    
    
    


12. 
    
    
    
    49. 
        
        
        
        51. 
            
        
        
        
        
    
    
    
    


13. 
    
    
    
    55. 
        
        
        
        57. or
            59.three-fourths of 61.50 less than
            63.the product of , , and 65.twice , increased by 5
        
        
        
        
    
    
    
    


14. in. 69. in. 71. 2 73. 13 75. 20


15. 
    
    
    
    79. 
        
        
        
        81. 
            
            
            
            83. 17 85. 36 87. 255
            
            
            
            
        
        
        
        
    
    
    
    


16. 8 91. a.Let weight of the Element (in pounds);
    weight of the Hummer (in pounds) b.6,400 lb


17. a.let age of Apple; age of IBM;
    age of Dell b.IBM: 112 years; Dell: 23 years


18. 60 101.

1.simplify 3.distributive 5.like 7. a.4, 9, 36

b.associative property of multiplication 9. a. b.

c. d. 11. a. b.can’t be simplified c.

d.can’t be simplified e. f. 13. a.

b. 15. 17. 19. 21.

23.11.2x 25. 60 c 27. 96 m 29.g 31. 5 x 33. 6 y

(z16) 12 t 63 m  35 q 300 t

18 x 3 x 5 6(h4)

  10 x  42 x

 

Study Set Section 8.2 (page 655)

8

27

x 9    

x x 80 

2 x 340    

x

 12  5 ^15

(x2) (36x)

xy z m

r t

1

2(200t) 0 a 20 0.1d 10 d

3(35h300) p 680 4 d 15

k^2 2,005 2 a 1 1,000n 2 p 90

l 15 50 x wl P 32 p

1

5

1

 (^12)
4 x 2 w
(12h) (x20)
Study Set Section 8.1 (page 644)
41
1,000
3
100
1
7
2
3
0.72

3
8
10
5
8
6
3
4

21
20
 1
1
20
19
20

1
6
4
9
8
35
3
2
5
9
− 4 − 3 − 2 − 1 01 234
2  32
Chapters 1–7 Cumulative Review (page 633)
A-48 Appendix V Answers to Selected Exercises