Question

What is the common difference for this arithmetic sequence?
-9, -15, -21, -27...

Answer 1

Explanation:

Let's find the common difference. (Or, the rule)

Our sequence:

-9, -15, -21, -27.

To get to -15, you must subtract 6.

To get to -21, you must subtract 6.

To get to -27, you must subtract 6.

The common difference (rule) is 6.