Answer
Please see below.
Work Step by Step
Please note that a cosine function $y=A\cos (Bx-C)$ has amplitude $|A|$, period $\frac{2\pi }{B}$, and phase shift $\frac{C}{B}$.
So the function $y=3\cos (2\pi x+4\pi )$ has amplitude $|3|=3$, period $\frac{2\pi }{2\pi }=1$, and phase shift $\frac{-4\pi }{2\pi }=-2$.
