Final answer:
To find the value of d(3), substitute 3 for p in the function d(p) = p² + 45p - 125. Simplify the expression to get d(3) = 19.
Step-by-step explanation:
To find the value of d(3), we need to substitute 3 for p in the function d(p) = p² + 45p - 125.
So, we have d(3) = 3² + 45(3) - 125.
Simplifying this expression, we get d(3) = 9 + 135 - 125 = 19.
Therefore, d(3) = 19.