Answer
$30$
Work Step by Step
Given: $f(x)=\dfrac{120x}{100-x}$
Plug $x=20$; we have
$f(20)=\dfrac{120(20)}{100-20}=\dfrac{2400}{80}$
Hence, $f(20)=30$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 5 - Section 5.7 - Polynomial Equations and Their Applications - Exercise Set - Page 394: 114
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