Answer
$-385$
Work Step by Step
Here, $a_1=-7, d=-7$
Sum of first $10$th term of an arithmetic sequence can be calculated as:
$S_n=\dfrac{n}{2}[2a_1+(n-1)d]$
Now,
$S_{10}=\dfrac{10}{2}[2(-7)+(10-1)(-7)]=5[-14+(9)(-7)]$
or, $=-385$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Test - Page 871: 6
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