Question

is this sequence arithmetic? If so, identify the common difference.

14,21,42,77,......

Answer 1

It is not an arithmetic sequence because the difference between consecutive terms is not a constant.
The difference between the first two terms is: 21 - 14 = 7.
The difference between the second and third term is: 42 - 21 = 21.
So the differences are not the same and therefore the sequence is not arithmetic.

Answer 2

thank you that helped alot