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Question 8 (7 marks) Sand is being poured into a pile, forming the shape of a cone With the base radius equal to the height.

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Question 8 (7 marks) Sand is being poured into a pile, forming the shape of a cone With the base radius equal to the height. The sand is being poured at a rate of 5 cm3 per second. Find the rate at which the radius of the cone is increasing, when the radius is 20 cm

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