Rebecca R. answered 10/24/18
Experienced Elementary Math, Prealgebra, Algebra 1, and Geometry Tutor
Hi, Ari.
Ok, so the product is the answer to a multiplication problem.
The product of 5 and the sum of a number(X) and 3 is
5(X + 3) = 12
5X + 15 = 12
5X = 12 - 15
5X = -3
X = -3/5
So the answer is b