The arithmetic sequence is ..
Find the common difference by subtracting successive terms.
\The common difference is 5.
\Add 5 to last term of the sequence to get the next termin the sequence.
\Continue adding 5 untill the next three terms are found.
\19 + 5 =
14,
14 + 5 =
9 and
14 + 5 =
4.
The next three terms are 14,
9,
4.