Question: Please help me with this calculus word problem. 5. A tapioca ball, commonly known as boba, is dropped into the tea, causing ripples in the

Please help me with this calculus word problem.

5. A tapioca ball, commonly known as "boba", is dropped into the tea, causing ripples in the form of concentric circles. The radius r of the outermost ripple is increasing at a constant rate of 2 mm per second. When the radius of the outermost ripple is reaches 20 mm, at what rate is the total area A of the disturbed tea expanding ?

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