Hi everybody, I am looking for some help with the following question, it seems more or less easy, but is getting a little challenging for me.

99^9/9^99 (for column A)

11^9/9^90 (for column B)

The answer states that both columns are equal, I've been trying using exponents rules, power rules and some factoring but I can't get it quite right.

If someone could show how to prove that both columns are equal, it will end my lack of sleep

thanks in advance to all