45y^2/9y^5
To simplify the expression, you can divide the numerator and the denominator by the greatest common factor, which in this case is y^2.
So, 45y^2 divided by 9y^5 becomes:
(45/9) * (y^2/y^5) = 5 * (y^2/y^5).
Now, to divide the remaining variables with the same base (y), subtract the exponents:
5 * y^(2-5) = 5 * y^(-3).
Therefore, the simplified expression is 5y^(-3).