Answer
See below
Work Step by Step
$R_1=\frac{2}{x}=2\times\frac{1}{x}\\R_2=\frac{5}{2x}=2.5\times\frac{1}{x}$
Since $2\lt2.5$, the cost is smaller for the field in Exercise 21.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 8 Rational Functions - 8.4 Multiply and Divide Rational Expressions - 8.4 Exercises - Skill Practice - Page 578: 23
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