Question: A stone is dropped in a lake, creating a circular ripple that travels outward at a speed of 40 cm/s. (a) Find a function g

A stone is dropped in a lake, creating a circular ripple that travels outward at a speed of 40 cm/s. (a) Find a function g that models the radius as a function of time t, in seconds. g(t) = (b) Find a function f that models the area of the circle as a function of the radius r, in cm. f(r) = (c) Find f g. f g =

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