Solve the problem.A rock is dropped into a lake causing a circular wave to form and move away from the point where the rock hit the water. At time t, in seconds after the rock hit the water, the radius of the circle is given by 
Let A(r) = ?r2 represent the area of a circle of radius r. Find and interpret 
A. (A?r)(t) = 4.9?t2; This function gives the area as a function of time.
B. (A?r)(t) = 24.01?t2; This function gives the area as a function of time.
C. (A?r)(t) = 4.9?t; This function gives the time as a function of area.
D. (A?r)(t) = 24.01?t2; This function gives the time as a function of area.
Answer: B
Mathematics
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