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

$-54=a_1$

#### 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: $26=a_1+8\times(11-1)$ $26-80=-54=a_1$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.