Answer
$f(-3)=\frac{9}{2}, f(0)=3, f(2)=-1$.
Work Step by Step
$f(x)=3-\frac{x}{2}$ for $x\lt2$ and $f(x)=2x-5$ for $x\geq2$
$f(-3)=3-\frac{-3}{2}\Rightarrow f(-3)=\frac{9}{2}$
$f(0)=3-\frac{0}{2}\Rightarrow f(0)=3$
$f(2)=2(2)-5\Rightarrow f(2)=-1$