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Sand is falling off a conveyer belt onto a conical pile at 17 cubic feet per minute. The altitude of the pile is approximately two fifths the width

Need calc. help w/ question #3 in the attached document

Sand is falling off a conveyer belt onto a conical pile at 17 cubic feet per minute. The altitude of the pile is approximately two fifths the width of the pile. 1. At what rate is the height of the pile changing when the pile is 12 feet high? 2. At what rate is the radius of the pile changing when the pile is 12 feet high? 3. At what rate is the diameter of the pile changing when the pile is 12 feet high? 4. Suppose the height of the pile is changing at half a foot per minute. At what rate is the volume of the pile changing when the pile is 25 feet high.
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