Question

Identify the common difference
-21,-18,-15,-12

Answer 1

d = 3

Explanation:

The common difference d between consecutive terms is

d = - 18 - (- 21) = - 18 + 21 = 3

d = - 15 - (- 18) = - 15 + 18 = 3

d = - 12 - (- 15) = - 12 + 15 = 3