Determine wheter each sequence is an Arithmetic sequence

Question

-3,1,5,9

1/2,3/4,5/8,7/16

Answer 1

-3, 1, 5, 9 is an arithmetic sequence with a common difference of +4.

 

1/2, 3/4, 5/8, 7/16 is not an arithmetic sequence. 3/4 - 1/2 = 1/4, 5/8 - 3/4 = -1/8, 7/16 - 5/8 = -3/16

They do not share a common difference.