Question

what is the recursive rule for the sequence -7.4, -21.2, -35, -48.8, -62.6

an=an-1+13.8
an=an+1+13.8
an=an+1-13.8 <-- or D
an=an-1-13.8 <-- or C

Answer 1

each term is calculated using the previous term, not the next one!

Answer 2

oohh!! Thanks Steve.

Answer 3

- 21.2 - ( - 7.4 ) = - 21.2 + 7.4 = - 13.8

- 35 - ( - 21.2 ) = - 35 + 21.2 = - 13.8

- 48.8 - ( - 35 ) = - 48.8 + 35 = - 13.8


- 62.6 - ( - 48.8 ) = - 62.6 + 48 = - 13.8


an = a(n-1)- 13.8

Answer 4

Thanks!