The function $f(x) = {x+5}$ can be described as the function which increases the input by $5\text{.}$ The inverse of the function $f(x)\text{,}$ which is written $f^{-1}(x)\text{,}$ is a function which does the opposite of what $f(x)$ does.

1. Write the formula for the inverse function $f^{-1}(x)\text{.}$ Remember, this should be a function which does the opposite of increasing the input by $5\text{.}$
   $f^{-1}(x) =$
2. Now, evaluate each of the following expressions:
   $f(19) =$
   $f^{-1}({24}) =$