Expression

[Yunie]

Find an expression in terms of n, for the nth term of the sequence 17, 14, 11, 8, 5, ...


The answer is 20 - 3n

But I do not understand why the answer is that so could anyone explain it to me? Thanks a lot! :)

[opus]

17 is the first element of the sequence, so f(1)=17 and f(2)=14 .... f(5)=5.
If you put the n=1 into the formula you get 17
.....