If [math]f and [math]g are functions, suppose we know the following things:
[math]\begin{aligned}
f(7) \amp= 12
\amp f(5) \amp= 15
\amp g(8)\amp= 13
\amp g(4)\amp= 17
\end{aligned}

- What is [math]
f^{-1}(15)\text{?} [math]f^{-1}(15) = - What is [math]
g^{-1}(13)\text{?} [math]g^{-1}(13) =