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Section 2.5 Order of Operations and Algebraic Expressions 121 62. Bill’s daughter is 30 years younger than he is. Write an expression for his daughter’s age if Bill is A years old. 63. The price of gas has doubled over the last 3 years. If gas cost g dollars per gallon 3 years ago, write an expression of the current price per gallon. 64. Suppose that the amount of rain that fell on Monday was twice the amount that fell on Sunday. Write an expression for the amount of rain on Monday, if Sunday’s amount was t inches. For Exercises 65–76, write each phrase as an algebraic expression. (See Example 6.) 65. The product of 12 and n 66. The product of 3 and z 67. x subtracted from 9 68. p subtracted from 18 69. The quotient of t and 2 70. The quotient of 10 and w 71. 14 added to y 72. 150 added to c 73. Twice the sum of c and d 74. Twice the sum of a and b 75. The difference of x and 8 76. The difference of m and 5 Concept 3: Evaluating Algebraic Expressions For Exercises 77–96, evaluate the expressions for the given values of the variables. (See Examples 7–9.) 77. x 9z for x 10 and z 3 78. a 7b for a 3 and b 6 79. x 5y z for x 10, y 5, and z 2 80. 9p 4t w for p 2, t 6, and w 50 81. a b 3c for a 7, b 2, and c 4 82. w 2y z for w 9, y 10, and z 3 83. 3mn for m 8 and n 2 84. 5pq for p 4 and q 2 85. for y 9 86. for z 18 0y 0 0z 0 87. for w 4 88. for m 15 0w0 0m0 89. x2 for x 3 90. n2 for n 9 91. x2 for x 3 92. n2 for n 9 93. for x 5 and y 6 94. for a 8 and b 2 4 0x 3y 0 2 04a b 0 6 0m n2 0 4 0c2 d2 0 95. for m 2 and n 3 96. for c 3 and d 5 Expanding Your Skills 97. Find the average temperature: 8, 11, 4, 1, 9, 4, 5 98. Find the average temperature: 15, 12, 10, 3, 0, 2, 3 99. Find the average score: 8, 8, 6, 5, 2, 3, 3, 3, 0, 4 100. Find the average score: 6, 2, 5, 1, 0, 3, 4, 2, 7, 4


miller_prealgebra_2e_ch1_3
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