To evaluate the expression for r = -3 and s = 5, we substitute these values into the expression.
First, let's rewrite the expression as:
3r / (s^(-2))
Substituting r = -3 and s = 5:
3(-3) / (5^(-2))
Now, let's simplify this expression:
-9 / (1/25)
To divide by a fraction, we can multiply by its reciprocal:
-9 * (25/1)
Multiplying the numbers:
-225
Therefore, the value of the expression for r = -3 and s = 5 is -225.