Question

How do you tell whether the sequence `3, 5.5, 8, 10.5, 13` is arithmetic?

Answer 1

There is a common difference of `2.5`

Explanation:

If there is a common difference, the sequence is arithmetic.

`5.5 - 3 = 2.5`

`8 - 5.5 = 2.5`

`10.5 - 8 = 2.5`

and so on.

Hope that makes sense!