Answer
We can estimate that the period is 20 years.
Work Step by Step
We can see that the graphs seem to repeat similar shapes every 20 years approximately.
Therefore, we can estimate that the period is 20 years.
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 4 - Review Exercises - Page 192: 54a
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