Algebra-1

To determine which sequence is an arithmetic sequence, we need to check if the difference between consecutive terms is constant. An arithmetic sequence has a constant difference between each term.

Let's analyze each sequence:

A. 

Calculate the differences between consecutive terms:

15 - 5 = 10

15 - 15 = 0

35 - 15 = 20

The differences are 10, 0, and 20, which are not consistent. This sequence is not arithmetic.

B. 

Calculate the ratios between consecutive terms (this sequence seems geometric):

The ratios are consistently 3. This sequence is geometric, not arithmetic.

C.