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Math Help - volume of cone

  1. #1
    Red
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    volume of cone

    Was wondering if i had the correct formula to plug in different values of r.

    The formula for the volume of a cone is given below. Find the rate of change of the volume for each of the radii given below if dr/dt is 4 inches per minute and h = 15r.

    V = (1/3)πr^2h

    πr^2(5r) is what i get as the formula but i'm guessing it's probably off, and also needing to know if there is a way to double check your answer if you're unsure of the formula you end up with.
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  2. #2
    A Plied Mathematician
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    I would carefully write out the volume equation, with your h plugged in, first. Then do the calculus.
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