I've been at these problems for HOURS!!!

In the expression below, each letter represents a different digit.

A^5 + B^5 + C^5 + D^5 + E^5 = ABCDE

and

In the array of numbers below, what number should go where the question mark is?

3 11 21 41 91

6 14 15 23 53

3 5 6 8 ?

I would really appriciate any help I can get, thanks very much! (: