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Rate of change

  1. Oct 22, 2007 #1
    The base of a cone-shaped tank is a circle of radius 5 feet, and the vertex of the cone is 12 below the base. The tank is filled to a depth of 7 feet, and water is flowing out of the tank at a rate of 3 cubic feet per minute.

    Find the rate of change of the depth of the water in the tank.
  2. jcsd
  3. Oct 22, 2007 #2
    I find it helpful to think about what it is exactly I'm asked to find. Do you know what your are looking for?
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