Algebra II question please help?

What is the recursive rule for the sequence: -7.4, -21.2, -35, -48.8, -62.6....?

a) an = an + 1 + 13.8

b) an = an + 1 -13.8

c) an = an - 1 -13.8

d) an = an - 1 + 13.8


I chose C

ted s2013-05-19T21:14:49Z

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But do you realize that a) and c) are the same ??...

depending upon what you call the initial term...a_0 or a_1 ,

ie n = 0,1 ...vs n = 1, 2 ....