The expression $$\left(\frac{x^{-3} y^{2} z^{-2}}{y^{-2} z^{4} x^{-6}}\right)^{-1}$$
equals $z^r/(x^s y^t)$ where
$r$, the exponent of $z$, is:
$s$, the exponent of $x$, is:
$t$, the exponent of $y$, is:
[NOTE: Your answers cannot be algebraic expressions.]