Answer
Answer C
Work Step by Step
We have $R(x)=(15-x)(50+10x)$
$R(x)=-10x^2+100x+750$
Find the x-coordinate: $x=\frac{-b}{2a}=\frac{-100}{2.(-10)}=5$
Substitute for x: $15-x=15-5=10$
Hence, the correct answer is C.
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 4 Quadratic Functions and Factoring - Standardized Test Practice - Context-Based Multiple Choice - Page 326: 4
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