Question

What is the common difference for this arithmetic sequence?

45, 39, 33, 27, 21, ...

A. 39
B. 45
C. 6
D. -6

Answer 1

Answer: D. -6

Explanation:

An arithmetic sequence adds the same number each time to the number before it. To find the difference, subtract a term from the one directly after it. For this problem, I'll use 39 and 45. 39-45 = -6.