36 CHAPTER R Review of Basic Concepts 23. 0 -140 0 20 = ` -14 2 ` 24. ` 10 -2 ` = 0 100 0 -20 25. 0 a - b0 = 0 a0 - 0 b0 , if 0 6a 6b 26. If a is negative, then 0 a0 = -a. Find each sum or difference. See Example 2. 27. -6 + 1-132 28. -8 + 1-162 29. -15 + 6 30. -17 + 9 31. 13 + 1-42 32. 19 + 1-132 33. - 7 3 + 3 4 34. - 5 6 + 4 9 35. -2.8 + 4.5 36. -3.8 + 6.2 37. 4 - 9 38. 3 - 7 39. -6 - 5 40. -8 - 17 41. 8 - 1-132 42. 12 - 1-222 43. -12.31 - 1-2.132 44. -15.88 - 1-9.422 45. 9 10 - a4 3b 46. 3 14 - a3 4b 47. -8 - 6 48. -7 - 15 49. -2 - -4 50. 16 - -13 Find each product or quotient where possible. See Example 3. 51. -81-52 52. -201-42 53. 51-72 54. 61-92 55. 4102 56. 01-82 57. - 5 2 a12 25b 58. - 9 7 a21 36b 59. - 3 8 a24 9 b 60. - 2 11 a22 4 b 61. -0.81-0.52 62. -0.51-0.62 63. -0.0610.42 64. -0.0810.72 65. -14 2 66. -39 13 67. -24 -4 68. -45 -9 69. 100 -25 70. 150 -30 71. 0 -8 72. 0 -14 73. 5 0 74. 13 0 75. - 10 17 , a12 5 b 76. - 22 23 , a33 5 b 77. 12 13 - 4 3 78. 7 6 - 2 3 79. -7.2 0.8 80. -4.5 0.9 Evaluate each expression. See Example 4. 81. -24 82. -35 83. 1-224 84. 1-226 85. 1-325 86. 1-225 87. -2 # 34 88. -4 # 53 Evaluate each expression. See Example 5. 89. -2 # 5 + 12 , 3 90. 9 # 3 - 16 , 4 91. -419 - 82 + 1-721223 92. 61-52 - 1-321224 93. A4 - 23BA -2 + 225 B 94. A5 - 32BA 216 - 23B
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