9) Determine whether Rolle's can be applied to the function f on the given interval. If so, find the value of c. a) f(x) = x' - x' -5x -3 on [-1, 3] b) f (x) = x' - x on [-1, 2] 10) A golfer hits a ball into a pond of still water, causing a circular ripple. If the radius of the circle increases at the constant rate of 0.5 m/s, how fast is the area of the circle increasing when the radius of the ripple is 2 m