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Algebra 2 / Trig

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Here is the problem that I'm having trouble with:

Rewrite each series in a sigma notation and find its sum.


I have no idea how I find the common difference or ratio in that one.

  • Algebra 2 / Trig -

    I don't think you will be able to do it with just those three terms.

  • Algebra 2 / Trig -

    perhaps you meant to type

    1 + .09 + .0081 + ...

    otherwise I agree with bob

    If so, then

    sum = [sigma] (.09)^(i-1) , i goes from 1 to infinity.

    use S(infinity) = a/(1-r)

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