Page 179 - Basic College Mathematics with Early Integers

156 C HAPTE R 2 I INTEGERS AND INTRODUCTION TO VARIABLES

Scores in golf can be 0 (also called par), a positive integer (also called above par), or a negative integer (also called
below par).The bar graph shows scores of selected golfers from a recent tournament. Use this graph for Exercises 95
through 98. (Source: LPGA)
Golf Scores of Selected Players
95. Find the difference between the lowest score shown
10
8 and the highest score shown.
8
6
4 3
96. Find the difference between the two lowest scores.
2
Scores 0 (par) 1 0
2
4 97. Find the average of the scores for Stanford, Downey,
6 and Redman. (Hint: Here, the average is the sum of
8 7 the scores divided by the number of players.)
10
12 11
14
Angela Danielle Song-Hee Stacy Michele Pat 98. Find the average of the scores for Stanford, Lewis,
Stanford Downey Kim Lewis Redman Hurst Redman, and Hurst.
Players
99. Can the average for these scores be greater than 100. Can the average of all the scores shown be less than
the highest score, 8? Explain why or why not. the lowest score, -11? Explain why or why not.

Review

Perform each indicated operation. See Sections 1.3, 1.4, 1.6, and 1.7.

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101. 45 90 102. 90 , 45 103. 90 - 45 104. 45 + 90

Find the perimeter of each figure. See Section 1.3.

105. Square 106. Parallelogram 107. Rectangle 108. Triangle

17 m 23 m
8 in. 5 cm 6 ft
32 m
3 cm 9 ft

Concept Extensions

Insert parentheses where needed so that each expression evaluates to the given number.

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109. 2 7 - 5 3; evaluates to 12 110. 7 3 - 4 2; evaluates to 34
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111. -6 10 - 4; evaluates to -36 112. 2 8 , 4 - 20; evaluates to -36
Copyright 2012 Pearson Education, Inc.
113. Are parentheses necessary in the expression 114. Are parentheses necessary in the expression
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3 + 14 52? Explain your answer. 13 + 42 5? Explain your answer.
115. Discuss the effect parentheses have in an 116. Discuss the effect parentheses have in an
exponential expression. For example, what is the exponential expression. For example, what is the
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2 2 2 2
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difference between 1-62 and -6 ? difference between 12 42 and 2 4 ?