Answer
$g(-3)=-18$
$g(0)=0$
$g(4)=24$
Work Step by Step
The given function is
$\Rightarrow g(x)=6x$
Substitute $x=-3$.
$\Rightarrow g(-3)=6(-3)$
Simplify.
$\Rightarrow g(-3)=-18$
Substitute $x=0$.
$\Rightarrow g(0)=6(0)$
Simplify.
$\Rightarrow g(0)=0$
Substitute $x=4$.
$\Rightarrow g(4)=6(4)$
Simplify.
$\Rightarrow g(4)=24$