Answer
$-258$
Work Step by Step
Since, we have $S_n=\dfrac{a_1(1-r^{n})}{1-r}$
Here, $n=7,a_1=-6,r=-2$
Thus,
$S_{7}=\dfrac{-6[1-(-2)^{7}]}{1-(-2)}=\dfrac{-6}{3}(129)=-258$
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 - Review Exercises - Page 870: 41
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