Q8. The area of a circular pool of oil is increasing at a rate of5 millimetres2 per second. a. What is the function that determines the rate of change of the pool's radius? [10 marks] b. What is the actual rate of change of the pool's radius, 5 seconds after the oil spill has started? [10 marks] (Assume that the depth of the pool is constant and forms a perfect circle)