Answer
$g(-2)=-6$
$g(0)=0$
$g(5)=15$
Work Step by Step
$g(x)=3x$
When $x=-2$,
$g(-2)=3(-2)=-6$
When $x=0$,
$g(0)=3(0)=0$
When $x=5$,
$g(5)=3(5)=15$
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