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Pie Faced · Answer 1 · 2018-06-12T11:17:34+0000

''m' represents radius of the circle.

Substitute m(t) into Area function.

$A = \pi m^2 \\ \\ A = \pi (10t)^2 \\ \\ A = 100\pi t^2$

Now you have Area as function of time.

part B) sub t= 3 to find Area after 3 minutes.

$A(3) = 100\pi (3^2) = 900 \pi$

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