Page 342 - Basic College Mathematics with Early Integers

S E C T I O N 4.4 I DIVIDING DECIMALS 319

Choose the best estimate.

101. 8.62 * 41.7 102. 1.437 + 20.69 103. 78.6 , 97 104. 302.729 - 28.697
a. 36 a. 34 a. 7.86 a. 270
b. 32 b. 22 b. 0.786 b. 20
c. 360 c. 3.4 c. 786 c. 27
d. 3.6 d. 2.2 d. 7860 d. 300

Recall from Section 1.7 that the average of a list of numbers is their total divided by how many numbers there are in the
list. Use this procedure to find the average of the test scores listed in Exercises 105 and 106. If necessary, round to the
nearest tenth.

105. 86, 78, 91, 87 106. 56, 75, 80

107. The area of a rectangle is 38.7 square feet. If its 108. The perimeter of a square is 180.8 centimeters.
width is 4.5 feet, find its length. Find the length of a side.

38.7 Perimeter is
4.5 feet
square feet 180.8
centimeters
?
?

109. When dividing decimals, describe the process you 110. In your own words, describe how to quickly divide a
use to place the decimal point in the quotient. number by a power of 10 such as 10, 100, 1000, etc.

To convert wind speeds in miles per hour to knots, divide by 1.15. Use this information and the Saffir-Simpson Hurricane
Intensity chart below to answer Exercises 111 and 112. Round to the nearest tenth.

Saffir-Simpson Hurricane Intensity Scale
Barometric Pressure
Category Wind Speed [inches of mercury (Hg)] Storm Surge Damage Potential
1 (Weak) 75–95 mph Ú28.94 in. 4–5 ft Minimal damage to vegetation
2 (Moderate) 96–110 mph 28.50–28.93 in. 6–8 ft Moderate damage to houses

3 (Strong) 111–130 mph 27.91–28.49 in. 9–12 ft Extensive damage to small buildings
4 (Very Strong) 131–155 mph 27.17–27.90 in. 13–18 ft Extreme structural damage
5 (Devastating) 7155 mph 627.17 in. 718 ft Catastrophic building failures possible

111. The chart gives wind speeds in miles per hour. 112. What is the range of wind speeds for a Category 4
What is the range of wind speeds for a Category 1 hurricane in knots?
hurricane in knots?

113. A rancher is building a horse corral that’s shaped 114. A college student signed up for a new credit
like a rectangle with dimensions of 24.28 meters by card that guarantees her no interest charges on
15.675 meters. He plans to make a four-wire fence; transferred balances for a year.She transferred over a
that is, he will string four wires around the corral. $2523.86 balance from her old credit card.Her
How much wire will he need? minimum payment is $185.35 per month.If she pays
only the minimum,will she pay off her balance
before interest charges start again?