Right now in school we are covering limits but also doing a review. I have to simplify some exponents and got all of them on the assingment except two problems. They both involve exponents with different bases. The problems are

10^2x 2^10x

and

3^x + 4^x / 5^x

How would I go in approaching to solve these problems?

Also I am not sure if I simplified a problem enogh

The problem is

(1/8)^-pi/3

and I simplified it to 8^-pi/3.

Is there a way to simplify this answer further.