Answer
$(5^5)^3=5^{15}$
Work Step by Step
$(5^5)^?=5^{15}$
To raise a power to a power, we multiply the exponents. This means that the product of $5$ and the second exponent must be equal to $15$. This is only true if the second exponent is $3$ because $5\times3=15$
This gives us the equation $(5^5)^3=5^{15}$
