# Determine whether each sequence is an arithmetic sequence: 4, 9, 14, 19...

Determine whether each sequence is an arithmetic sequence: 4, 9, 14, 19...
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Marlene Welch
the standard arithmetic sequence is
a,a+d,a+2d,a+3d,......,a+(n−1)d
where a is the first term and d is the common difference
$•xd={a}_{2}-{a}_{1}={a}_{3}-{a}_{2}={a}_{n}-{a}_{n-1}$
here d=9−4=14−9=19−14=5
there is a common difference of 5 between the terms
the given terms form an arithmetic sequence