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Thread: Help with formula for curve

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    Help with formula for curve

    Have been looking for a formula to give me a curve similar to the following:-

    will post this 5 times untill I can post a link

    Solid blue line. Doesn't matter if it doesn't exactly fit, I think I can adjust the functions by trial and error once I get it into xls. I am after the y value by inputting the x value, the important bit being the the curve rises steeply, tails off but never starts to go back down as would a quadratic equation ( y=ax2+bx+c ) If someone has something it would be great, have been looking for what seems like ages, many thanks in advance
    Paul M
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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