Answer
$6, \ 270^\circ$.
See the graph below.
Work Step by Step
For the equation
$$
y=6\cos\frac{4}{3}x
$$
the amplitude is $6$ and the period is $P=\frac{360}{4/3}=270^\circ$.
See the graph below.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 14 - Section 14.2 - Period and Phase Shift - Exercise - Page 484: 12
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