Answer
$ h(-3)=16$
$ h(0)=13$
$h(8)=5$
Work Step by Step
The given function is
$\Rightarrow h(x)=13-x$
Substitute $x=-3$.
$\Rightarrow h(-3)=13-(-3)$
Simplify.
$\Rightarrow h(-3)=13+3$
$\Rightarrow h(-3)=16$
Substitute $x=0$.
$\Rightarrow h(0)=13-0$
Simplify.
$\Rightarrow h(0)=13$
Substitute $x=8$.
$\Rightarrow h(8)=13-8$
Simplify.
$\Rightarrow h(8)=5$
