Page 280 - Basic College Mathematics with Early Integers

S E C T I O N 3.7 I OPERATIONS ON MIXED NUMBERS 257

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77. If Tucson’s average rainfall is 11 inches and Yuma’s 78. A pair of crutches needs adjustment. One crutch is
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3 5
is 3 inches, how much more rain, on the average, 43 inches and the other is 41 inches. Find how
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much the short crutch should be lengthened to make
does Tucson get than Yuma?
both crutches the same length.

For Exercises 79 and 80, find the area of each figure.

79. 80.

1! yards
5 inches

2 yards
3q inches

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81. A model for a proposed computer chip measures 82. The Saltalamachios are planning to build a deck that
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1 1 1
inch by 1 inches. Find its area. measures 4 yards by 6 yards. Find the area of their
4 2 3
proposed deck.
1~ inches

! inch

4q yards

6a yards

For Exercises 83 and 84, find the perimeter of each figure.
83. 5a meters 84. 3~ yards 3~ yards

5 meters
3 meters 3~ yards 3~ yards

7√ meters
3~ yards
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85. A homeowner has 15 feet of plastic pipe. She cuts 86. A trim carpenter cuts a board 3 feet long from one
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1 1 6 feet long. How long is the remaining piece?
off a 2 -foot length and then a 3 -foot length. If she
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now needs a 10-foot piece of pipe, will the remaining ?
piece do? If not, by how much will the piece be short?
3≈ feet

3~ feet 2q feet 6 feet
?

15s feet