Question

Simplify: x^0 y^-3 / x^2 Y^-1

Answer 1

But if you're adding them the answer would be $1/ x^{2}y^2$

Answer 2

x^0 y^-3 / x^2 y^-1 
= 1 /  x^2 y^-1 (y^3)  ...because  x^0 = 1 and  [(y^-1) (y^3)] = y^2
= 1/(x^2 y^2)