Answer
$682$
Work Step by Step
$r=\dfrac {128}{32}=\dfrac {32}{8}=\dfrac {8}{2}=4;a_{1}=2\Rightarrow S_{n}=\dfrac {a_{1}\left( r^{n}-1\right) }{r-1}=\dfrac {2\times \left( 4^{5}-1\right) }{4-1}=682$
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: 33
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