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please explain how to do this one it says to simplify by adding like terms
2x^2 y+3yx^2+x^2 y-x^2 y-4x^2 y^2

evaluate:
x^2+y^3 if x=2 y=-3
4+-27=-23
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pm^2-z^3 if p=1 m=-4 z=-2
(1)(-4^2)-(-2)^3=(1)(16)-(-8)=16+8=24
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-x^2-y^3 if x=-3 y=-2...