Answer
See below.
Work Step by Step
The first $4$ terms of $\sum\limits_{i=1}^72^i$ are $2^1=2$, $2^2=4$, $2^3=8$, $2^4=16$. The common ratio is $2$.
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 - Section 11.3 - Geometric Sequences and Series - Concept and Vocabulary Check - Page 853: 6
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