Exercises 13.3, page 384

  1. 1. log43 + log47

  2. 3. log4(5x)

  3. 5. 3

  4. 7. 12

  5. 9. log53 + log511

  6. 11. log79 − log72

  7. 13. 3log2a

  8. 15. log6a + log6b + 2log6c

  9. 17. 5log5t

  10. 19. 12log2x − 2log2a

  11. 21. logbac

  12. 23. log53

  13. 25. logbx5/2

  14. 27. loge4π33

  15. 29.  − 5

  16. 31. 2.5

  17. 33. 3

  18. 35. 8

  19. 37. 2 + log32

  20. 39. 2 −  log27

  21. 41. 12 (1 + log32)

  22. 43. 3 + log103

  23. 45. y = 2x

  24. 47. y = 3x5

  25. 49. y = 49x3

  26. 51. y = 2(2ax)1/5

  27. 53. y = 2x

  28. 55. y = x225

  29. 57. log10x + log103 = log103x

  30. 59. y = loge(e2x) = 2logee + logex = 2 + logex

    The calculator graph of a curve that rises from the y-axis and through (0, 0.2).
  31. 61. 8

  32. 63. 2x

  33. 65. y1 = y2

    The calculator graph of a curve that begins at (0, negative 1), rises to (1, negative 0.5), then falls toward y = negative 1. All data are approximate.
  34. 67. D = aecr2 − br

  35. 69. T = 90.0e − 0.23t

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