Answer
$ -45$
Work Step by Step
Need to use the formula $a_n =a_1+(n-1) d$
Here, $a_1=4$ and $d=-7$
Plug $n=8$
$a_8= 4 +(8-1) \times (-7) $
or, $= 4-49$
or, $a_8= -45$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Section 10.1 - Sequences and Summation Notation - Exercise Set - Page 1051: 109
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