Tell whether the sequence is arithmetic. if it is, identify the common difference. -7,-3, 1,5 a) not arithmetic b) arithmetic, common difference is 4 c) arithmetic, common difference is 9 d) arithmetic, common difference is 7 tell whether the sequence is arithmetic. if it is, identify the common difference.-9,-17, -26,-33 a) not arithmetic b) arithmetic, common difference is 8 c) arithmetic, common difference is 9 d) arithmetic, common difference is 7 tell whether the sequence is arithmetic. if it is, identify the common difference. 19,8,-3,-14 a) not arithmetic b) arithmetic, common difference is -11 c) arithmetic, common difference is 5 d) arithmetic, common difference is 17