Question

helpppppp i don’t understand

Answer 1

To solve this problem you need to realize that f(x) basically means y, but the (x) is the actual value of x. 
Thus, the equation would actually be F(3) =1/3*4^3.

The first step to solving that equation is to PEMDAS.
This means you need to solve 4^3 first. The solution you should get is 64.

You then want to multiply 1/3 by 64, which is 64/3 A.

Answer 2

All you do is plug 3 into x so your new equation would be 
F(3)=1/3(4^3) 
       =1/3(64)
 F(3) = 64/3 is your answer its simplest as that.