A spherical balloon is being blown up so that its radius increases at a rate of 0 4 cm s Find the rate of increase of the surface area of the balloon when the radius is 20 cm

Question: A spherical balloon is being blown up so that its radius increases at a rate of 0.4 cm s . Find the rate of

A spherical balloon is being blown up so that its radius increases at a rate of 0.4 cm s⁻¹.
Find the rate of increase of the surface area of the balloon when the
radius is 20 cm.

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