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  3. (a) if a is the area of a circle with radius r and

(a) If A is the area of a circle with radius r and the circle...

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Calculus

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(a) If A is the area of a circle with radius r and the circle expands as time passes, find dA/dt in terms of (b) Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the radius of the oil spill increases at a constant rate of 1 m/s, how fast is the area of the spill increasing when the radius is 38 m?

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