Answer
There is a common difference of $32$ therefore the given terms form an arithmetic sequence.
Work Step by Step
The given terms can be terms of an arithmetic sequence if there is a common difference among consecutive terms.
Determine the difference between each pair of consecutive terms to obtain:
$68-100=-32;
\\36-68=-32;
\\4-36=-32$
There is a common difference of $32$ therefore the given terms form an arithmetic sequence.