Answer
It is not an arithmetic sequence.
Work Step by Step
A sequence is arithmetic if $a_2−a_1=a_3−a_2=a_4−a_3=a_5−a_4=...=d$
For the given sequence we have that:
$a_2-a_1=40-80=-40$
$a_3-a_2=20-40=-20$
It is not an arithmetic sequence.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.2 - Arithmetic Sequences and Partial Sums - 11.2 Exercises - Page 786: 8
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