Question

Is the sequence arithmetic? If so, identify the common difference. –2.4, 9.8, 22, 34.2, ...

Answer 1

The sequence is 12.2

Good luck. =]

Answer 2

9.8 - (-2.4) =  12.2
22 - 9.8 = 12.2
34.2 - 22 = 12.2

Its is arithmetic and the common difference is 12.2.