Rate of Change of a Circle's Area

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The radius of a circle increases linearly with time, as shown in the table. What is the rate of change of the circle’s area at $t = 4$ seconds?

$10\pi \;cm^2/s$

$2.5\pi \;cm^2/s$

$5\pi \;cm^2/s$

$\pi \;cm^2/s$

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