The following table lists the values of functions $f$ and $g$, and of their derivatives, $f'$ and $g'$, for $x=4$.
$x$ | $f(x)$ | $g(x)$ | $f'(x)$ | $g'(x)$
:-: | :-: | :-: | :-: | :-:
$4$ | $-4$ | $13$ | $~~~0$ | $8$
Let function $F$ be defined as $F(x)=f(x)\cdot g(x)$.
$F'(4)=$ [[☃ numeric-input 1]]