Rewrite in simplest radical form x56x16

I must assume that by "x56" you actually meant "x^56," or "x to the 56th power.

If that's the case, then  x^56 * x^16 = x^(56+16) = x^72, or "x to the 72nd power".

If at all possible, see a teacher regarding your "x56x16."  It's very ambiguous.

Fis the domain that we’ll make it better

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.