Compute the derivatives of the given functions.

1. $f(r) = 5 e^r$,
   $f'(r) =$.
2. $g(s) = 5 e^s + 20$,
   $g'(s) =$.
3. $h(t) = 6 t^2 - 9 e^t$,
   $h'(t) =$.