The volume of a cylinder of height 9 inches and radius r inches is given by the formula V = 9πr². Which is the correct expression for dV ? dt о dV dt dV dt = =U 18πr dr 9r2. dt dr dh dt dt dV dr = 18πr- dt dt dV 18πT === dt dt dV dt 0 о о Suppose that the radius is expanding at a rate of 0.8 inches per second. How fast is the volume changing when the radius is 2.6 inches? Use at least 5 decimal places in your answer. о answer: cubic inches per second

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