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March 26, 2017

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What is the first term of a geometric series with a summation of 800, 4 terms and a common ratio of 3?

  • Algebra 2 - ,

    easy way:
    1,3,9,27 adds to 40
    800/40 = 20

    so, 20,60,180,540

    or,

    a(1+r+r^2+r^3) = a(r^4-1)/(r-1) = a*80/2 = 40a

    so, a = 800/40 = 20

  • Algebra 2 - ,

    Thank you, I think I understand how to work it out now! That helped me out so much!

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