Page 341 - Basic College Mathematics with Early Integers

318 C HAPTE R 4 I DECIMALS

77. There are approximately 39.37 inches in 1 meter. 78. There are 2.54 centimeters in 1 inch. How many
How many meters, to the nearest tenth of a meter, inches are there in 50 centimeters? Round to the
are there in 200 inches? nearest tenth.
1 meter 1 inch
39.37 inches 2.54 cm
79. In the United States, an average child will wear 80. In 2007,American farmers received an average of
down 730 crayons by his or her tenth birthday. Find $47.20 per hundred pounds of turkey.What was the
the number of boxes of 64 crayons this is equivalent average price per pound for turkeys? Round to the
to. Round to the nearest tenth. (Source: Binney & nearest cent. (Source: National Agricultural Statistics
Smith Inc.) Service)

A child is to receive a dose of 0.5 teaspoon of cough medicine every 4 hours. If the bottle contains 4 fluid ounces, answer
Exercises 81 through 84.

81. A fluid ounce equals 6 teaspoons. How many
teaspoons are in 4 fluid ounces?

82. The bottle of medicine contains how many doses for
the child? (Hint: See Exercise 81.)

83. If the child takes a dose every four hours, how many
days will the medicine last?

84. If the child takes a dose every six hours, how many
days will the medicine last?

85. Americans ages 18–22 drive, on average, 86. Drake Saucier was interested in the gas mileage on his
12,900 miles per year.About how many miles each “new” used car. He filled the tank, drove 423.8 miles,
week is that? Round to the nearest tenth. and filled the tank again.When he refilled the tank, it
(Note: There are 52 weeks in a year.) (Source: U.S. took 19.35 gallons of gas. Calculate the miles per gallon
Department of Energy) for Drake’s car. Round to the nearest tenth

87. The book Harry Potter and the Deathly Hallows was 88. The leading money winner in men’s professional golf
released to the public on July 21, 2007. Booksellers in in 2008 was Vijay Singh. He earned approximately
the United States sold approximately 8292 thousand $6,601,000. Suppose he had earned this working
copies in the first 24 hours after release. If the same 40 hours each week for a year. Determine his
number of books were sold each hour, calculate the hourly wage to the nearest cent. (Note: There are
number of books sold each hour in the United States 52 weeks in a year.) (Source: Professional Golf
for that first day. Association)

Review

Write each decimal as a fraction. See Section 4.1.

89. 0.9 90. 0.7 91. 0.05 92. 0.08
Copyright 2012 Pearson Education, Inc.
Concept Extensions

Mixed Practice (Sections 4.2, 4.3, 4.4) Perform the indicated operation.

93. 1.278 , 0.3 94. 1.278 * 0.3 95. 1.278 + 0.3 96. 1.278 - 0.3
1000 87.2
97. (-8.6)(3.1) 98. 7.2 + 0.05 + 49.1 99. 100.
- 95.71 -10,000