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dy Find at = = - 4ify = - 4x* + 4 and = - 5. dt dt dy dtdy Find at c = 2ify = - - 3 and = - 1. dt dt dx dtGravel is being dumped from a conveyor belt at a rate of 112] cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 1? feet high? Recall that the volume of a right circular cone with height h and radius of the base r is given by 1 V = szh ft _m Aspherieal snowball is melting in such a way that its radius is decreasing at a rate of [Li emfmin. At what rate is the volume of the snowball decreasing when the radius is 11 cm. [Note the answer is a positive number}. \"\"3 mill . . . 4 Hmt: The volume of a sphere of radius r 15 V = m"3 3 A street light is at the top of a 14 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 ft from the base of the pole? ft sec