Answer
See below.
Work Step by Step
Plugging in the different values:
$a_1=(-1)^1=-1$
$a_2=(-1)^2=1$
$a_3=(-1)^3=-1$
$a_4=(-1)^4=1$
$a_5=(-1)^5=-1$
$a_5-a_4=-1-1=-2\ne a_4-a_3=1-(-1)=2$, thus this 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: 17
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