Answer
Amplitude: 5
Period: $\pi/2$
Phase: 4
Horizontal shift: 0
Work Step by Step
Using the base form $y=a\cdot $cos$(k(x-b))$, one can find the data. The amplitude is $|a|$ which is 5 in this example. The period is found using $\frac{2\pi}{k}$, so $\frac{2\pi}{4}=\pi/2$. The phase is $k$, which is $4$. And the horizontal shift is represented by $b$, which, in this case, is $0$.
