What is the recursive rule for the sequence?

Question

-7.4, -21.2, -35, -48.8, -62.5

I got an=an+1 -13.8 where a1=-7.4

Answer 1

Partly correct, it should be a(n) = a(n-1) - 13.8, not a(n) = a(n+1) - 13.8

This is because a(n) is given by subtracting 13.8 from the number *before* it, which is a(n-1)

Answer 2

THank you Arora. I guess I need to be more careful with formulas