Determine whether the sequence is arithmetic. If so, find the common difference.
$$- 3 , - 7 , - 11 , - 15 , - 19$$
A) 1
B) - 4
C) - 3
D) 4
E) not arithmetic

Question

Quizplus · Accepted Answer

For an arithmetic sequence, the difference between consecutive terms is constant. 
The difference between the first two terms is -7 - (-3) = -4
The difference between the second and third terms is -11 - (-7) = -4
The difference between the third and fourth terms is -15 - (-11) = -4
The difference between the fourth and fifth terms is -19 - (-15) = -4
Since the common difference is -4, the sequence is arithmetic. Therefore, the answer is (B).

Determine Whether the Sequence Is Arithmetic −3,−7,−11,−15,−19- 3 , - 7 , - 11 , - 15 , - 19−3,−7,−11,−15,−19

Determine Whether the Sequence Is Arithmetic $- 3 , - 7 , - 11 , - 15 , - 19$