Ds has nth term as homework, most of it is okay and he understands it, fairly simple answers like 5n-2 etc
But the following just seem way too complicated
3,7, 11, 14, 18
the differences don't seem to make sense ( 4, 4, 3, 4,)
also
1, 8, 15, 22, 27
differences
(7, 7, 7, 5)
Any ideas, have tried squaring them etc
I am almost starting to think there are printing errors!