Let $f(x) = \sqrt{x - 3}$ and $g(x) = x^{2} +3$. Evaluate each of the following.

$f(g(10)) =$
$f(g(5)) =$
$g(f(5)) =$
$f(g(2)) =$
$g(f(2)) =$

If there is no answer, enter "undefined".

Are the following statements true or false for general functions?
? True False   Given two functions $f$ and $g$, then $f(g(x)) = g(f(x))$.
? True False   Given two functions $f$ and $g$, then $f(g(x)) = g(f(x))$ only if $f$ and $g$ are inverses of each other.