Posted by **Alex** on Monday, December 5, 2011 at 11:54am.

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

- precalc -
**Steve**, Monday, December 5, 2011 at 12:09pm
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:

6.9-6.1 = .8

7.7-6.9 = .8

8.5-7.7 = .8

9.3-8.5 = .8

looks like an A.S. to me.

- precalc -
**sherko**, Wednesday, February 20, 2013 at 11:33am
Determine the 8th term of the following arithmetic sequence. -7, 2, 11, 20...

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