Answer:
z^3
----------------
x y^2
Step-by-step explanation:
x^-1 y^-2
------------
z^-3
The negative in the exponent means it goes in the denominator if it is in the numerator and it goes in the numerator if it is in the denominator
z^3
----------------
x^1 y^2
but x^1 is the same as x
z^3
----------------
x y^2
