Answer
Please see below.
Work Step by Step
Please note that the function $y=0.2 \sin (\frac{\pi }{10} x + \pi )$ has amplitude $|0.2|=0.2$, period $\frac{2 \pi }{\frac{\pi }{10} }=20$, and phase shift $\frac{\pi }{\frac{\pi }{10}} =10$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
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 598: 103
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