Precalculus (6th Edition) Blitzer

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

Chapter 3 - Section 3.2 - Exponential Functions - Exercise Set - Page 466: 132

Answer

Please see below.

Work Step by Step

Looking at the graph, we find that $9$ months elapsed before the average score fell below $65$.
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