A pebble is dropped into a calm pond causing ripples in the form of concentric circles. The radius r of the outer ripple is increasing at a constant rate of foot per second. When the radius is 6 feet, at what rate is the total area A of the disturbed water changing? O a. none of the choices O b. 4 square feet per second O c. 27 square feet per second O d. 8T square feet per second Oe. 4T square feet per second

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