Answer
$S_{10}=110$
Work Step by Step
$a_1=2$ and $a_n=a_{10}=20$
$S_n=\frac{n}{2}(a_1+a_n)$
$S_{10}=\frac{10}{2}(2+20)=5(22)=110$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.2 - Arithmetic Sequences and Partial Sums - 11.2 Exercises - Page 786: 45
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