Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.2 Arithmetic Sequences and Series - 14.2 Exercise Set: 26

Answer

$-54=a_1$

Work Step by Step

The n th term of an arithmetic sequence can be calculated as: $a_n=a_1+d\times(n-1)$ Here: $a_{11}=26$, $d=8$ and we have to find $a_{1}$. By substituting we get: $26=a_1+8\times(11-1)$ $26-80=-54=a_1$
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