1.A thin metal disk with circle shaped is burn and its radius expands at rate 0.01 cm/second. When the radius is 50 cm, find the rate of change of surface area of the disk b) circumference of the disk


2.Water is flowing out from a tank in the shape of the cone at rate 5cm³/s. The height of the cone is 10 cm and radius 4 cm. What is the rate of change with respect to time of water level when the height is 6 cm. water surface area at that height​



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