Question

Which sequences are arithmetic? Select three options.

A. –8.6, –5.0, –1.4, 2.2, 5.8, …
B. 2, –2.2, 2.42, –2.662, 2.9282, …
C. 5, 1, –3, –7, –11, …
D. –3, 3, 9, 15, 21, …
E. –6.2, –3.1, –1.55, –0.775, –0.3875, …

Answer 1

A. –8.6, –5.0, –1.4, 2.2, 5.8, …

C. 5, 1, –3, –7, –11, …

D. –3, 3, 9, 15, 21, …

Explanation:

If a sequence is an arithmetic sequence, the difference between any two terms must be the same for all terms.

This is known as the common difference

The correct choices are:
A : Common Difference = 3.6

C. Common difference = -4

D. Common difference = 6