Me, tell wheather the sequence is arithmetic. if it is , what is the common difference? -12,-7,-2,a yes ; 5b yes ; 8c yes : 3d no

Yes; 5 (choice A)

We add 5 to each term to get the next

-12+5 = -7

-7+5 = -2

-2+5 = 3

and so on. The nth term formula is

an = -12 + 5(n-1)

If you were to plug in n = 1, 2, 3, ... then it should generate the terms shown

the answer is d. (1.2, -4.7) on edgn

hope this !