Page 361 - Basic College Mathematics with Early Integers

53. Find the height of the tree. Round the height to one 54. Find the height of the antenna. Round the height to
decimal place. one decimal place.

? 32 feet
168 ft
?

20 feet
60 ft

55. The playing field for football is a rectangle that is 56. A soccer field is in the shape of a rectangle and its
300 feet long by 160 feet wide. Find, to the nearest dimensions depend on the age of the players.The
foot, the length of a straight-line run that started dimensions of the soccer field below are the
at one corner and went diagonally to end at the minimum dimensions for international play. Find the
opposite corner. length of the diagonal of this rectangle. Round the
answer to the nearest tenth of a yard.

?
?
160 feet
70 yd
110 yd
300 feet

Review

Write each fraction in simplest form. See Section 3.2.
10 10 24
57. 58. 59.
12 15 60
35 30 18
60. 61. 62.
75 72 30

Concept Extensions

Use the results of Exercises 17–20 and approximate each square root to the nearest whole without using a calculator or
table.Then use a calculator or Appendix A.6 to check. See Example 5.
63. 238 64. 227 65. 2101 66. 285

67. Without using a calculator, explain how you know that 68. Without using a calculator, explain how you know that
2105 is not approximately 9.875. 227 is not approximately 3.296.

Does the set form the lengths of the sides of a right triangle? See the Concept Check in this section.

69. 25, 60, 65 70. 20, 45, 50
71. Find the exact length of x.Then give a two-decimal-place approximation.
Copyright 2012 Pearson Education, Inc.
x
12 inches
10 inches

8 inches
338