Precalculus (6th Edition) Blitzer

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

Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 597: 75


33 days.

Work Step by Step

Based on the given graph, the physical cycle is represented by the red curve. On 01/24/15, the red curve starts at zero; after one period it will reach zero again on 02/26/15. The number of days in between is $7+26=33\ days$, which gives the period.
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