Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 1 - Section 1.3 - More on Functions and Their Graphs - Exercise Set - Page 200: 125

Answer

See below:

Work Step by Step

The graph belongs to a cubic polynomial. The minimum point of the function is $3.989$. This means that the number of doctor visit first decreases until the person reaches an age of 20 and then increases as the person grows old.
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