Answer
$74$
Work Step by Step
We sum from i = low bound to i = high bound.
$3(3+2) + 4(4+2) + 5(5+2) = 3(5) + 4(6) +5(7) = 15 + 24 + 35 = 74$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.