Tell whether the sequence is arithmetic. If it is, what is the common difference?
10, 15, 21, 28,
To determine if the sequence is arithmetic, we check if the difference between consecutive terms is constant.
The difference between the second term (15) and the first term (10) is 15 - 10 = 5.
The difference between the third term (21) and the second term (15) is 21 - 15 = 6.
The difference between the fourth term (28) and the third term (21) is 28 - 21 = 7.
Since the differences are not constant, the sequence is not arithmetic.