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OpenStudy (anonymous):

What is the 8th term of the geometric sequence where a1 = 625 and a3 = 25

OpenStudy (anonymous):

well you know that the first term is 625 so find the difference by finding out what 625 +x = 25 then you know the difference. then you plug that into the equations that should have been provided for you

OpenStudy (asnaseer):

this is virtually identical to your previous question: http://openstudy.com/updates/4fc29732e4b0964abc83e4db use the same methods explained to you there to find the answer.

OpenStudy (anonymous):

Again, utilize the formula \(a_n=a_1 C^{n-1}\) to find out what \(C\) is for your sequence.

OpenStudy (anonymous):

that formula confuses me

OpenStudy (anonymous):

What is confusing you about it? Every time you add \(1\) to \(n\), you are increasing the term by a power of \(C\), which is what you want. \(C\) is the common ratio.

OpenStudy (asnaseer):

I would then suggest you use this site to first learn a bit more about these types of sequences: http://www.mathsisfun.com/algebra/sequences-sums-geometric.html

OpenStudy (anonymous):

try to solve yourself

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