What is the recursive rule for the sequence? ?2.7, ?8.3, ?13.9, ?19.5, ?25.1, ...
1) an=an-1-5.6, where a1=-2.7
2) an=an-1+5.6, where a1=-2.7
3) an=an+1-5.6, where a1=-2.7
4) an=an+1+5.6, where a1=-2.7