which of the following sequences are arithmetic? identify the common difference.WITH SOLUTION
1) -3,-1,1,3,5,7,9...
2) 15.5,14,12.5,11,9.5,8...
3) 84,80,74,66,56,44...
4) -8,6,-4,2,0...
5)-50,-44,-38,-32,-26​