precalc
posted by Alex on .
Determine whether the sequence is geometric or arithmetic. Then give the general formula for the nth term of the sequence.
6.1, 6.9, 7.7, 8.5, 9.3,...
I think it is Geometric, but i don't know how to find the formula

If it's geometric, the ratio of successive terms does not change:
6.9/6.1 = 1.131
7.7/6.9 = 1.116
...
not geometric
If it's arithmetic, the difference between terms does not change:
6.96.1 = .8
7.76.9 = .8
8.57.7 = .8
9.38.5 = .8
looks like an A.S. to me. 
Determine the 8th term of the following arithmetic sequence. 7, 2, 11, 20...