\f2) If the length of the edge of a cube is increasing at a rate of 4 cm/s, how fast is the volume of the cube increasing when the edge length is 15 cm? 3) For the function f(x) = (x2 4-)3, a) Find the intervals of increase or decrease b) Find the local maximum and minimum values c) Find the intervals of concavity and the inflection points. 4) Find two numbers whose difference is 100 and whose product is a minimum