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(1) The volume of a cube is increasing at a rate of 10 cm3/min. How fast...

(1) The volume of a cube is increasing at a rate of 10 cm3/min. How fast is the surface area increasing when the length of an edge is 20 cm?

(2) Suppose oil spills from a ruptured tanker and spreads in a circular pattern. If the circumference of the oil spill increases at a constant rate of 2 m/s, how fast is the area of the spill increasing when the radius is 30 m?

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