A spherical balloon is inflating with helium at a rate of 64π ft3 min. How fast is the balloon's radius increasing at the instant the radius is 2 ft? Write an equation relating the volume of a sphere, V, and the radius of the sphere, r. (Type an exact answer, using π as needed.) Differentiate both sides of the equation with respect to t. dV dt = ( ) dr dt (Type an exact answer, using π as needed. Type an expression using r as the variable.) The balloon's radius is increasing at a rate of at the instant the radius is 2 ft. (Simplify your answer.)

A spherical balloon is inflating with helium at a rate of 64π ft3 min. How fast is the balloon's radius increasing at the instant the radius is 2 ft? Write an equation relating the volume of a sphere, V, and the radius of the sphere, r. (Type an exact answer, using π as needed.) Differentiate both sides of the equation with respect to t. dV dt = ( ) dr dt (Type an exact answer, using π as needed. Type an expression using r as the variable.) The balloon's radius is increasing at a rate of at the instant the radius is 2 ft. (Simplify your answer.)

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A spherical balloon is inflating with helium at a rate of 64 π f t 3 m i n . How fast is the balloon's radius increasing at the instant the radius is 2 f t ?
Write an equation relating the volume of a sphere, V , and the radius of the sphere, r . (Type an exact answer, using π as needed.) Differentiate both sides of the equation with respect to t .
d V d t = ( ) d r d t
(Type an exact answer, using π as needed. Type an expression using r as the variable.) The balloon's radius is increasing at a rate of at the instant the radius is 2 f t . (Simplify your answer.)
ft
ft
\mathrm { ft } ^ { 3 } / \text { min}
ft/min

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