
Nathan B. answered 09/11/18
Tutor
5
(20)
Elementary and Algebraic skilled
"Three times the sum of" means that we need to add before we multiply, so the expression format looks like this:
3(4 + 9)
What you need to do is add 4 and 9 together. Then once that's done, you multiply that sum by 3 for your final answer.