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Xaze

  • one year ago

Help please? Will fan and medal !

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  1. Xaze
    • one year ago
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    Diana received 65 points on a project for school. She can make changes and receive three-tenths of the missing points back. She can do this 10 times . Create the formula for the sum of this geometric series, and explain your steps in solving for the maximum grade Diana can receive.

  2. anonymous
    • one year ago
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    first correction she gets 35(3/10 second correction she gets 35(3/10)^2 third correction she gets 35(3/10) ^3 And so on Added together we get ∑ 35(3/10)n+1 as n goes from 0 to ∞ 35(3/10) ∑ (3/10)n the sum of an infinite geometric series is a/(1-r) which in this case is 1/(7/10) = 10/7 35(3/10)(10/7) = 15 So maximum grade is 65 + 15 = 80 The series was converging because 0 < r < 1

  3. Xaze
    • one year ago
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    @_greatmath7, Thank you very much, you're truly a life-saver! Granted you your medal... think you can help with a few more? ^^

  4. anonymous
    • one year ago
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    yep

  5. anonymous
    • one year ago
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    of course

  6. Xaze
    • one year ago
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    Thanks! But I'll go ahead and post it as a new question, so I can give you more medals, haha ^^

  7. anonymous
    • one year ago
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    u don't have to but thanks. :)

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spraguer (Moderator)
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