5. (5 points). The area of a circle is given by A = 71" where r is the radius. Suppose the radius is increasing at a rate of 5 cm/sec. At what rate is the area of the circle increasing when the radius is 15 cm? 6. (5 points). Find the absolute maximum and absolute minimum values of the function f (t) = t (8-t) on the interval [0, 27]