2 answers:
(x3)(x4) is x7 because when you have a problem like that, you have to ADD your exponents.
-(m4)3 is -m12 since you're multiplying them.
(z3)5 is z15
y4 x y5 is y9
thats all i know of. hope it helps cx
7. z^15
8. -1m^20
9. -27^6
10. x^7
11. y^9
12. -y^7
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