I have a problem to solve but I am stuck trying to find out how to determine the correct answer. If it was the same variable I would be able to do it but since it's two variables (m and n) I'm not sure how to proceed. I am supposed to re-write it as a single exponent. Please forgive me if the equation format is not using the proper symbols.

ThanksCode:(m/n)^5 (m/n)^-6 (m/n)^0 -------(Fractional Line)------- (m/n)^20

The answer should be: (n/m)^21