(a) Find the average rate of change of the area of a circle with respect to its radius r as r changes from 4 to each of the following. (i)    4 to 5     (ii)    4 to 4.5     (iii)    4 to 4.1     (b) Find the instantaneous rate of change when r = 4. A'(4) =

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Exponential Growth Model

The relation that represents an exponential function is: