Page 616 - Basic College Mathematics with Early Integers

S E C T I O N 8.4 I SOLVING EQUATIONS USING ADDITION AND MULTIPLICATION PROPERTIES 593

x z
76. 213w + 72 - 415 - 2w2 = 6 77. -20 - (-50) = 78. -2 - 10 =
9 10

79. 12 + 5t = 6(t + 2) 80. 4 + 3c = 2(c + 2) 81. 3(5c - 1) - 2 = 13c + 3

82. 4(2t + 5) - 21 = 7t - 6 83. 10 + 5(z - 2) = 4z + 1 84. 14 + 4(w - 5) = 6 - 2w

Objective Write each sentence as an equation. See Example 8.

85. The sum of -42 and 16 is -26. 86. The difference of -30 and 10 equals -40.

87. The product of -5 and -29 gives 145. 88. The quotient of -16 and 2 yields -8.

89. Three times the difference of -14 and 2 amounts to -48. 90. The product of -2 and the sum of 3 and 12 is -30.

91. The quotient of 100 and twice 50 is equal to 1. 92. Seventeen subtracted from -12 equals -29.

Review

The following bar graph shows the number of U.S. federal individual income tax returns that are filed electronically
during the years shown (some years are projected). Use this graph to answer Exercises 93 through 96. See Section 7.1.

93. Approximate the number of
Total Electronically Filed electronically filed returns
U.S. Individual Income Tax Returns for 2010.
120
110
Electronically Filed Returns (in millions) 90 94. Determine the number of
100
electronically filed returns for 2009.
80
70
60
50
40
95. By how much is the number of
30
20
to increase from 2013 to 2016?
10 electronically filed returns projected
0
2009 2010 2011 2012 2013 2014 2015 2016
Year
96. Describe any trends shown in this
Source: IRS Compliance Research Division; some years are projected
graph.