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GTLife Puzzle 41

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    GTLife Puzzle 41

    An ink blot has radius of 4mm, and its area is increasing at the rate of 8π mm^2 s^-1. At what rate is the radius increasing?
    a. 1mm/s
    b. 2mm/s
    c. 3mm/s
    d. 4mm/s
    e. 5mm/s

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