Answer
The value of $r$ for which $v$ is a local maximum is $2\over3$
Work Step by Step
The local maximum value is the one that changes the function from increasing (positive slope ) to decreasing (negative slope).
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 2 - Section 2.3 - Getting Information from the Graph of a Function - 2.3 Exercises - Page 182: 66
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