Answer
$S_5=484$
Work Step by Step
Using $S_n=\dfrac{a_1(1-r^n)}{1-r}$, the sum of the first $
5
$ terms of the sequence $
4,12,36,...
$ is
\begin{array}{l}
S_5=\dfrac{4(1-3^5)}{1-3}\\\\
S_5=\dfrac{4(-242)}{-2}\\\\
S_5=484
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Section 11.4 - Partial Sums of Arithmetic and Geometric Sequences - Exercise Set - Page 658: 3
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