Answer
$-385$
Work Step by Step
Here, $ a_1=7$ and $ r=-2$
$ a_{10}=-7+(10-1)(-7)=-7-63=-70$
$ S_{10}=\dfrac{10[ (-7)+(-70)}{2}$
$= \dfrac{10[ -7-70]}{2}$
$=5(-77)$
$=-385$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Test - Page 1126: 12
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