A competitive knitter is knitting a circular place mat. The radius of the mat is given by the formula r(t) = 5- 605/(t + 11)²

Question

A competitive knitter is knitting a circular place mat. The radius of the mat is given by the formula
r(t) = 5- 605/(t + 11)²
with 7 in centimeters and t in seconds.
A. Find the rate at which the area of the mat is increasing.
Select an answer
B. Use your expression to find the rate at which the area is expanding at t = 3.

Kunduz · Accepted Answer

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