Note that when dividing, and the base is the same, you can subtract the power signs.
(5^5)/(5^2) = 5^(5 - 2)
5 - 2 = 3
5^3 = a^b
Simplify.
5^3 = 5 x 5 x 5
5 x 5 x 5 = 125
c = 125
----------------------------------------------------------------------------------------------------------------
125 is your answer
----------------------------------------------------------------------------------------------------------------
hope this helps