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14 Suppose that a tumor in a person's body has a spherical shape and that treatment is causing the radius of the tumor to decrease

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14

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Suppose that a tumor in a person's body has a spherical shape and that treatment is causing the radius of the tumor to decrease at a rate of 1 millimeter per month. At what rate is the volume decreasing when the radius is 9 mm? (Recall that V = =mr3.) mm /month

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