Answer
See below.
Work Step by Step
As we can see, $a_1=3$ and each term is four times the previous one, so $a_n=4a_{n-1}$ is the recursive rule.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 12 Sequences and Series - Cumulative Review - Page 848: 43
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