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March 30, 2017

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A girl enrolling in typing class type 60(x+1)/x+9 words per minute after x weeks of lesson. Determine the maximum possible number of words the girl can type as time passes

  • math limit - ,

    intuitively , as x ---> ∞
    (x+1)/(x+9) ---> 1

    so lim 60(x+1)/(x+9) , as x --> ∞
    = 60

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