The given sequence is not arithmetic because the common difference between consecutive terms is not the same. The difference between -15 and -9 is 6, but the difference between -9 and -3 is 6 as well. However, the difference between -3 and 3 is 6. Since the common difference is not constant, the sequence is not arithmetic.
Therefore, the answer is D. No.
Tell whether the sequence is arithmetic. If it is, what is the common difference?
–15, –9, –3, 3, . . .
A. Yes; 3
B. Yes; 5
C. Yes; 6
D. No
1 answer
1 answer