(1 point) A contour diagram for the smooth function z = f (x, y) is shown below. (a) Is 2. an increasing or decreasing function of x? ? v Of y? ? v (b) Is fx positive or negative? ? v How about fy? ? v (C) Is f\" positive or negative? ? v How about fyy? ? v (d) In what direction does Vf point at point P? in the direction (Give a vector that points generally in the right direction.) In what direction does V f point at point Q? in the direction (Again, give a vector that points generally in the right direction.) (e) ls Vf longer at P or at Q? 7 v