Answer
$20$
Work Step by Step
The sum of an infinite geometric sequence is given as: $ S=\dfrac{a_1}{1-r}$
Here, $ a_1=4$ and common ratio is: $ r=0.8$
$ S=\dfrac{a_1}{1-r}$
Now,
$ S=\dfrac{4}{1-0.8}=20$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Review Exercises - Page 1125: 49
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