Answer
$12$
Work Step by Step
1. For this arithmetic sequence, we have $a_9=a_1+(9-1)d$, thus $8d=18-(-6)=24$ and $d=3$
2. We have $a_7=a_1+(7-1)d=-6+6(3)=12$
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 - Quiz - Page 1053: 4
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