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

Feb 15, 2018

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!