You can put this solution on YOUR website! 18 12 6 0 -6
30 18 6 -6 -6
48 24 0 -12
72 24 -12
96 12
108
The sixth term could be 108
See problem #880183 for an explanation
See link below
http://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.880183.html