Answer
$a)$ P is decreasing in the interval $25 \leq t \leq150$
$b)$ The graph has upward concavity in the interval $25 \leq t \leq150$
Work Step by Step
Answer given by direct observation of the graph.
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 1 - Ingredients of Change: Functions and Limits - 1.2 Activities - Page 20: 10
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