Question: As a snowball melts, its surface area decreases. The surface area, in square centimetres, is modelled by the equation () = 4^2 , where r

As a snowball melts, its surface area decreases. The surface area, in square centimetres, is modelled by the equation () = 4^2 , where r is the radius, in centimetres.

a. Determine the average rate of change of the surface area as the radius decreases from 25 cm to 20 cm.

b. Determine the rate of melting at when r = 10 cm.

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