Question

What is the common difference between the elements of the arithmetic sequence below?

–18, –22.5, –27, –31.5, –36

Answer 1

-4.5

Explanation:

(–22.5) - (-18) = -4.5

(–27) - (–22.5) = -4.5

(–31.5) - (-27) = -4.5

(-36) - (–31.5) = -4.5