**I have been studying all day the Arithmetic and Geometric sequences, but I I am very confused on Yesturday’s POD; about the laptop. I am still having problems converting word problems into formulas or equations.
**Iam also having problems finding the rule when the sequence is “neither”. Because when it is Arithmetic we know it is adding, and Geometric is multipling. But when is neither?
**One example of a Geometric sequence is:
Find a formula for the nth term of the geometric sequence
3,4.5.6.75,….
Tuesday, May 1, 2007
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3 comments:
Answer:
Use the formula tn= t1 x r^(n-1). In this case, t1 is 3 and the common ratio r is 1.5.
tn = 3 x 1.5^ (n-1)
= 3 x 1.5^n/1.5^1
= 3/1.5 x (1.5)^n = 2 x (1.5)^n
Fio,
You have an acceptable formula in your 1st line:
tn = 3 x 1.5^ (n-1)
The rest, though lovely, is not necessary.
Seems strange to me that you perform this higher level algebra but that you can't follow the lap top problem.
Want to ask something about that problem?
As to your second question, I made a post on sequences which aren't either geometric or arithmetic, you should check it out.
http://11bprecalculus07.blogspot.com/2007/04/complex-sequences.html
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