12. Sand falls from a conveyor belt at a rate of 14 m2 /min onto the top of a conical pile. The height of the pile is always cm min when the height is 4 m The height is changing at a rate of (Type an exact answer, using t as needed.) three-eighths of the base diameter. How fast are the height and the radius changing when the pile is 4 m high? cm/min when the height is 4 m. The radius is changing at a rate of (Type an exact answer, using as needed.)

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