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: 76

Answer

28 days

Work Step by Step

Based on the given graph, the emotional cycle is represented by the blue curve. On 02/01/15, the curve reaches a zero; after one period it will reach zero again on 02/29/15. The number of days in between is $29-1=28$ days, which gives the period.
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