Answer
Amplitude $2$, period $2\pi$, see graph.
Work Step by Step
1. Given $y=-2cos(x+\frac{\pi}{4})$, we can identify its amplitude as $|A|=|-2|=2$ and period as $p=2\pi$
2. First graph $y=cos(x)$ (blue), shift the curve $\frac{\pi}{4}$ to the left, stretch vertically by a factor of 2, then reflect around the x-axis (red).
