Answer
3
Work Step by Step
$a_{m}-a_{n}=\left( m-n\right) d\Rightarrow a_{15}-a_{5}=87-27=\left( 15-5\right) \times d\Rightarrow 60=10d\Rightarrow d=6\Rightarrow a_{5}=a_{1}+4d\Rightarrow 27=a_{1}+4\times 6\Rightarrow a_{1}=3$
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 1025: 33
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