Find the simplified form of the expression (y^-3)^-5y^3

The simplified form of the expression (y^-3)^-5y^3 is y^15.

Explanation:
To simplify the expression, follow the rules of exponents.
First, simplify the inside parentheses by multiplying the exponents:
(y^-3)^-5 = y^(-3*-5) = y^15

Then, multiply the result by y^3:
y^15 * y^3 = y^(15+3) = y^18

Therefore, the simplified form of the expression is y^15.