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Math Help - I need helppppppppp

  1. #1
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    Angry I need helppppppppp



    , , and
    what is the Pf
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  2. #2
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    Re: I need helppppppppp

    19 = 9*[1/(1-Pf/478)]
    => 19/9 = 1/((478 - Pf)/478)
    =>19/9 = 478/(478-Pf)
    =>19(478-Pf)=478*9

    I think you can take it from here
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