Page 353 - Basic College Mathematics with Early Integers

330 C HAPTE R 4 I DECIMALS

Objective Find the area of each triangle or rectangle. See Example 15.

79. 80.
4.4 feet
9 inches 17 feet

5.7 inches
81. 0.62 yard 82. 1.2 miles

W yard √ mile

Objective Evaluate each expression for x = 6, y = 0.3, and z =-2.4. See Example 16.
x
83. z 2 84. y 2 85. x - y 86. x - z 87. 4y - z 88. + 2z
y

Review

Simplify. See Sections 1.9 and 3.6.
2 5 2 2 2 3 3
#
4
2 #
89. 6 2 90. 4 3 91. a ba b 92. a b a b
5 2 3 2
Concept Extensions

Without calculating, describe each number as 6 1, = 1, or 7 1. See the Concept Check in this section.

101 99 99
93. 1.0 94. 1.0000 95. 1.00001 96. 97. 98.
99 100 99

In 2008, there were 14,120 commercial radio stations in the United States.The most popular formats are listed in the table
along with their counts. Use this graph to answer Exercises 99 through 102.
Top Commercial Radio
Station Formats in 2008
99. Write the fraction of radio stations with a hip-hop music
format as a decimal. Round to the nearest thousandth.
2500
Number of Stations 1500 1342
100. Write the fraction of radio stations with a Spanish format as a 2000 2092
decimal. Round to the nearest hundredth.

101. Estimate, by rounding each number in the table to the nearest 1000 745
hundred, the total number of stations with the top six formats 455
500 436
in 2008. 204
Country Hip Hop College Spanish Top 40
102. Use your estimate from Exercise 101 to write the fraction of News/talk
radio stations accounted for by the top six formats as a
decimal. Round to the nearest hundredth. Copyright 2012 Pearson Education, Inc.
Format (Total stations: 14,120)

103. Describe two ways to write fractions 104. Describe two ways to write mixed numbers as
as decimals. decimals.