Answer
$\bf{Graph (a)}$.
Work Step by Step
It can be seen that the slope of the graph never approaches to negative. It oscillates in between either zero or positive.
Hence, our correct graph is $\bf{Graph (a)}$.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 3: Derivatives - Section 3.2 - The Derivative as a Function - Exercises 3.2 - Page 115: 28
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