What is the recursive rule for the sequence? @musiclover

A(n) = 17-5(n)

If n = 1 then a(1) = 17-5(1) = 17-5 = 12, so the first term would be 12
If n = 2 then a(2) = 17-5(2) = 17-10 = 7

The difference would be a(1) - a(2)  =  12 - 7 = 5

 So the recursive formula would be an = a(n-1) + 5 and the first term was 12, so the answer would be A.