Answer
True
Work Step by Step
The derivative of a function $f$ at a point is the same as the tangent at that point, so if the derivative is negative at a point, then the value of $f'$ at the same point will also be less than zero.
Calculus, 10th Edition (Anton)
by Anton, Howard
Published by
Wiley
ISBN 10:
0-47064-772-8
ISBN 13:
978-0-47064-772-1
Chapter 2 - The Derivative - 2.2 The Derivative Function - Exercises Set 2.2 - Page 132: 28
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