Answer
Arithmetic sequence
$d=-3$
Work Step by Step
$-7-\left( -4\right) =\left( -4\right) -\left( -1\right) =\left( -1\right) -2=2-5=-3\Rightarrow d=-3$
Then this is arithmetic sequence
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - Summary Exercises on Sequences and Series - Exercises - Page 1038: 8
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