Answer
amplitude$=4$, period$=2$.
Work Step by Step
Given $y=-4cos(\pi x)$, we can find its amplitude$=|-4|=4$, period$=\frac{2\pi}{\pi}=2$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Cumulative Review - Page 657: 12
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