A competitive knitter is knitting a circular place mat. The radius of the mat is...

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A competitive knitter is knitting a circular place mat. The radius of the mat is given by the formular(t) = 5- 605/(t + 11)with 7 in centimeters and t in seconds.A. Find the rate at which the area of the mat is increasing.Select an answerB. Use your expression to find the rate at which the area is expanding at t = 3.

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