Answer
$10$
Work Step by Step
$\sum ^{4}_{i=1}\left( -2\right) ^{i}=\dfrac {a_{1}\left( r^{n}-1\right) }{r-1}=\dfrac {\left( -2\right) \times \left( \left( -2\right) ^{4}-1\right) }{-2-1}=10$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - 11.3 Geometric Sequences and Series - 11.3 Exercises - Page 1034: 40
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