Answer
$-5$
Work Step by Step
$d=a_{n+1}-a_{n}=-12-\left( -7\right) =-7-\left( -2\right) =-2-3=-5$
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 - 11.2 Arithmetic Sequences and Series - 11.2 Exercises - Page 1024: 13
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