To find a power of a power, multiply the exponents. This is an extension of the product of powers property. Suppose you have a number raised to a power, and you multiply the whole expression by itself over and over. This is the same as raising the expression to a power:
(53)4 = (53)(53)(53)(53)
But the product of powers property tells us that
(53)(53)(53)(53) = 53 + 3 + 3 + 3 = 54(3) = 512
So it is enough to just multiply the powers!
(ab)c = abc