Answer
There is a common difference of $12$ therefore the given sequence is arithmetic.
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:
$-19-(-31) = -19+31=12;
\\-7-(-19)=-7+19=12;
\\5-(-7) = 5+7 = 12$
There is a common difference of $12$ therefore the given sequence is arithmetic.