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:
$26=a_1+8\times(11-1)$
$26-80=-54=a_1$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
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 - Page 902: 26
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