Answer
$3$, $x$-axis.
Work Step by Step
The graph of $y = -3 sin (x)$ is obtained by stretching the graph of $y = sin (x)$ by a factor of $3$ and reflecting across the $x$-axis.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.4 Translations of the Graphs of the Sine and Cosine Functions - 6.4 Exercises - Page 612: 4
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