D.18. CHAPTER 18
Exercise 1
5. (a) 7.55 m (b) 3.55 m (c) 2.99 m
7. $4852
9. (a) $ 6.73; (b); 7.33; (c) $7.39
11. $1823
13. 285 units
15. 12.4 million
17. 18.2 million barrels
19. 506°C
21. 0.100 A
23. 1040°F
25. 9.568 in. Hg
27. 72 mA
29. 30%
Exercise 2
1. log3 81 = 4
3. log4 4096 = 6
5. logx 995 = 5
7. 102 = 100
9. 53 = 125
11. 357 = x
13. 1.441
15. 0.773
17. 1.684
19. 2.922
21. 1.438
23. 906
25. 7.69
27. 2.32
29. 94,200
31. 3.877
33. 7.7685
35. 0.6125
37. 0.3177
39. 0.3104
41. 71.1
43. 6.33
45. 379
47. 144.2
49. 14.3 yr
51. 14 yr
53. 2773 ft
55. 17.5 yr
Exercise 3
1. log 2 − log 3
3. log a + log b
5. log x + log y + log z
7. log 3 + log x − log 4
9. log 2 − log x
11. log a + log b + log c − log d
13. log 12
15. log(3/2)
17. log 27
19. log(a3c4/b2)
21. log(xy2z3/ab2c3)
23. 2x = xy2
25. p − q = 100
27. 1
29. 2
31. x
33. 3y
35. 3.63
37. 1.639
39. 2.28
41. 195
43. −8.80
45. 5.46
Exercise 4
1. 2.81
3. 16.1
5. 2.46
7. 1.17
9. 5.10
11. 1.49
13. 0.239
15. −3.44
17. 1.39
19. 0.0416 s
21. 22.4 s
23. 55 yr
25. 1.15 mi
27. 9.7 yr
29. 19.8 yr
31. 42.3 yr
Exercise 5
1. 2
3. 1/3
5. 2/3
7. 2/3
9. 2
11. 3
13. 25
15. 6
17. 3/2
19. 47.5
21. −11.0, 9.05
23. 10/3
25. 22
27. 0.928
29. 0.916
31. 12
33. 101
35. 25.56 in. Hg
37. 1300 kW
39. 11.2 in.
41. 10−7
43. 40
45. −3.01 dB
47. 13 dB
49. 39 dB
51. −0.915 dB
53. 6.02 dB
Review Problems
1. logx 352 = 5.2
3. log24 x = 1.4
5. x124 = 5.2
7. 3/4
9. 1/128
11. log 3 + log x − log z
13. log 10
15.
17. 2.5611
19. 1.2695
21. 701.5
23. 0.337
25. 4.4394
27. −4.7410
29. 4.362 ...
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