Answer
$3$, $\frac{2\pi}{3}$, $\frac{\pi}{3}$.
See graph.
Work Step by Step
1. Given $y=3sin(3x-\pi)=3sin3(x-\frac{\pi}{3})$, we can find the amplitude $|A|=3$, period $p=\frac{2\pi}{3}$, and phase shift $\frac{\pi}{3}$.
2. See graph.
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