Answer
Geometric $r=2.5$
Work Step by Step
$4, 10, 25, 62.5, 156.25, 390.625, . . .$
$\frac{a_2}{a_1}=\frac{10}{4}=2.5=r$
$ra_2=25=a_3$
$ra_3=62.5=a_4$
$ra_4=156.25=a_5$
and so on. The sequence is geometric with common ratio $r=2.5$.
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 9 - Conic Sections, Sequences, and Series - 9.4 Geometric Sequences - 9.4 Exercises - Page 736: 2
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