Page 320 - Basic College Mathematics with Early Integers

S E C T I O N 4.2 I ADDING AND SUBTRACTING DECIMALS 297

Objective Solve. For Exercises 67 and 68, the solutions have been started for you. See Examples 12 and 13.

67. Ann-Margaret Tober bought a book for $32.48. 68. Phillip Guillot bought a car part for $18.26. If he paid
If she paid with two $20 bills, what was her with two $10 bills, what was his change?
change?
Start the solution:
Start the solution: 1. UNDERSTAND the problem. Reread it as many
1. UNDERSTAND the problem. Reread it as many times as needed.
times as needed. 2. TRANSLATE into an equation. (Fill in the blank.)
2. TRANSLATE into an equation. (Fill in the blank.) two cost of
change is minus
two cost of $10 bills car part
change is minus
$20 bills book
T T T T
T T T T change = 20 - _____
change = 40 - _____
Finish with
Finish with 3. SOLVE and 4. INTERPRET.
3. SOLVE and 4. INTERPRET.

69. Microsoft stock opened the day at $21.90 per share, 70. A pair of eyeglasses costs a total of $347.89.The
and the closing price the same day was $22.07. By frames of the glasses are $97.23. How much do the
how much did the price of each share change? lenses of the eyeglasses cost?

71. Find the perimeter. 72. Find the perimeter.

4.2 in. 5.78 in.
Square 7.14 meters
7.8 in.

73. The Apple iPhone was a revolutionary touch screen 74. The Google phone, G1, which was introduced in
phone when it was introduced in 2007. It measured October 2008 to rival the Apple iPhone, measures
4.5
by 2.4
. Find the perimeter of this phone. 4.6
by 2.16
. Find the perimeter of the phone.
(Source: New York Times) (Source: New York Times)

75. The average wind speed at the weather station on 76. The average annual rainfall in Omaha, Nebraska, is
Mt.Washington in New Hampshire is 35.2 miles per 30.22 inches.The average annual rainfall in New
hour.The highest speed ever recorded at the station Orleans, Louisiana, is 61.88 inches. On average, how
is 321.0 miles per hour. How much faster is the much more rain does New Orleans receive annually
highest speed than the average wind speed? than Omaha? (Source: National Climatic Data
(Source: National Climatic Data Center) Center)