Answer
$d=-3$
Work Step by Step
The common difference for the arithmetic sequence:
$115, 112, 109, 106, . . .$
is
$d=a_{n+1}-a_n$
$d=a_2-a_1=112-115=-3$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 14 - Sequences, Series, and the Binomial Theorem - Connecting: The Concepts - Exercises - Page 909: 1
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