#### Answer

$10$

#### Work Step by Step

$\sum ^{4}_{i=1}\left( -2\right) ^{i}=\dfrac {a_{1}\left( r^{n}-1\right) }{r-1}=\dfrac {\left( -2\right) \times \left( \left( -2\right) ^{4}-1\right) }{-2-1}=10$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$10$

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