Which is a shrink of an exponential growth function?

A. f(x) = One-third(3)x
B. f(x) = 3(3)x
C. f(x) = One-third (one-third) Superscript x
D. f(x) = 3 (one-third) Superscript x

It sounds like you want to vertically compress an exponential growth function. If so, then the answer is (1/3)(3)^x, which is choice A.

This is because anything with (1/3)^x represents a decay function, allowing us to rule out C and D.

Choice B is a growth function, but comparing y = (3)^x to y = 3(3)^x, and we see there is a vertical stretch as opposed to a vertical compression going on. So we can rule out choice B as well. The only thing left is choice A.