Answer
The given sequence is not arithmetic.
Work Step by Step
You are given the sequence $100,10,1,0.1$.
Check to see if there is a common difference (the difference between consecutive terms) and if there is, the sequence would be arithmetic:
Here, we have:
$10-100=-90\\
1-10=-9\\
0.1-1=0.9$
There is no common difference so the sequence is not arithmetic.