Would the problem (xz^3)^-4 be simplified to 1/x4z12?

Answer 1

yes

1
------------
x^4 z^12

which is

x^-4 z^-12

Answer 2

PS
I hope you got my note about the previous question. Only combine LIKE terms !

Answer 3

Yes, thank you. I had the answer you wrote but wasn't sure.