Answer
$\sqrt{22}.$
Work Step by Step
The magnitude $||v||$ of a vector $v=ai+bj+ck$, can be computed using the formula
$||v||=\sqrt{a^2+b^2+c^2}$.
Hence, using the formula above gives
$||v||=\sqrt{(-2)^2+3^2+(-3)^2}\\||v||=\sqrt{4+9+9}\\||v||=\sqrt{22}.$