Calculus AB Assignment Applications of the Derivative B. Give a formula that relates x and h. C. How many firefighters should be used if the cost C of the fire is to be minimized? Justify your solution. 5. Let g be the function given by g(x) - x4 - 4x3 + 6x2 - 4x + k, where k is a constant. A. On what intervals is g increasing? Justify your answer. B. On what intervals is g concave upward? Justify your