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. pq = 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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