Answer
$135.8$
Work Step by Step
By product rule, $r'(x)=p(x)q'(x)+p'(x)q(x)$
Therefore, $r'(100)=p'(100)q(100)+p(100)q'(100)= 0.5\times160+4.65\times12 = 135.8$
Calculus Concepts: An Informal Approach to the Mathematics of Change 5th Edition
by LaTorre, Donald R.; Kenelly, John W.; Reed, Iris B.; Carpenter, Laurel R.; Harris, Cynthia R.
Published by
Brooks Cole
ISBN 10:
1-43904-957-2
ISBN 13:
978-1-43904-957-0
Chapter 3 - Determining Change: Derivatives - 3.5 Activities - Page 232: 2
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