Page 321 - Basic College Mathematics with Early Integers

298 C HAPTE R 4 I DECIMALS

This bar graph shows the increase in the total number of text messaging users in the United States.
Use this graph for Exercises 77 and 78. (Source: CellSigns, Inc.)

Total US Messaging Users (in millions) 77. Find the increase in U.S. messaging users from 2005
120 to 2006.
100.0
100 96.2
92.0
85.3 78. Find the increase in U.S. messaging users from 2007
Users (in millions) 60 62.9 to 2009.
75.3
80

40

20

0
2005 2006 2007 2008 2009 2010
Year

79. As of this writing, the top three U.S. movies that 80. In 1998, the average credit card late fee was $20.90.
made the most money through movie ticket sales By 2008, the average credit card late fee had increased
are Titanic (1997), $600.78 million; The Dark Knight by $14.30. Find the average credit card late fee in 2008.
(2008), $533.32 million; and Star Wars IV:A New (Source: MSNBC)
Hope (1977), $460.99 million.What was the total
amount of ticket sales for these three movies?
(Source: MovieWeb)

81. The snowiest city in the United States is Blue 82. The driest city in the world is Aswan, Egypt, which
Canyon, California, which receives an average of receives an average of only 0.02 inch of rain per year.
111.6 more inches of snow than the second snowiest Yuma,Arizona, is the driest city in the United States.
city.The second snowiest city in the United States is Yuma receives an average of 2.63 more inches of rain
Marquette, Michigan. Marquette receives an average each year than Aswan.What is the average annual
of 129.2 inches of snow annually. How much snow rainfall in Yuma? (Source: National Climatic Data
does Blue Canyon receive on average each year? Center)
(Source: National Climatic Data Center)

83. A landscape architect is planning a border for a 84. A contractor purchased enough railing to completely
flower garden shaped like a triangle.The sides of the enclose the newly built deck shown below. Find the
garden measure 12.4 feet, 29.34 feet, and 25.7 feet. amount of railing purchased.
Find the amount of border material needed.

29.34 feet
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12.4 feet 25.7 feet
15.7 feet
10.6 feet