Answer
$a_{25}=-39$
Work Step by Step
We can find any term of the arithmetic sequence using the formula
$a_n=a_1+d(n-1).$
In our conditions:
$a_1=9, d=-2, n=25.$
We have to find $a_{25}$.
$$a_{25}=9+(-2)(25-1)=9-2\cdot24=9-48=-39$$
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 - Mid-Chapter Review - Mixed Review - Page 915: 9
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