Answer
$h(x)$ is the top function and $g(x)$ is the middle function and $f(x)$ is the bottom function.
Work Step by Step
Given $f(x)=(1.1)^x, g(x)=(1.2)^x$, and $h(x)=(1.25)^x$.
We see that the growth factor of $f(x)$ is the smallest of the three functions and that the growth factor of $h(x)$ is the largest of the three functions. Hence, $h(x)$ will grow faster than both $f(x)$ and $g(x)$ .
This suggests that $h(x)$ is the top function and $g(x)$ is the middle function and $f(x)$ is the bottom function.