Question

5^-1 z^7
__________
5^2 z^9

= 5^3
______
z^2

Answer 1

I noticed yesterday you had several problems typed this way that remained unanswered.

That is probably because none of the tutors were able to decipher it and thus left it alone.

for the above do you mean:
5^-1 z^7 /(5^2 z^9 ) = 5^3 / z^2 ??

Answer 2

yes, I am sorry