Question

In the arithmetic sequence {−9,−4,1,6,11,…}, what is the common difference?

Answer 1

Answer: 5

Explanation:

First no (a) = -9

Common difference = second no. - first no.

=-4-(-9)

=-4+9

=5

Answer 2

d = 5

Explanation:

The common difference (d) is the difference between consecutive terms in the sequence and is calculated as

d = - 4 - (- 9) = 1 - (- 4) = 6 - 1 = 11 - 6 = 5