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Mathematics 7 Online
OpenStudy (anonymous):

A pebble is dropped into a calm pond, causing ripples in the form of concentric circles. The radius (in feet) of the outer ripple is given by R(t)=0.6t where t is the time in seconds after the pebble strikes the water. The area of the circle is given by the function A(r)=╥R^2Find and interpret (A(R(t)).

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