Final answer:
To evaluate the algebraic expression 3c + 17 for c = -15, substitute -15 for c in the expression and simplify.
Step-by-step explanation:
To evaluate the algebraic expression 3c + 17 for c = -15, we substitute the value of c into the expression:
3(-15) + 17
Calculating this expression, we get:
-45 + 17
Which simplifies to:
-28.