Answer
15, 36, 55
Work Step by Step
$\frac{5(5+1)}{2}=15$
$\frac{8(8+1)}{2}=36$
$\frac{10(10+1)}{2}=55$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - P.S. Problem Solving - Page 157: 2b
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