The surface z = f(x, y) is shown in the diagram. The green point is A = (-2, 2, 0) and the red point is B = (2, 2, 0). Z 0,88 -0,25 1,38 (a) Are the following quantities positive, negative, or zero? Positive v 1. fr(B) Negative v 2. fx(A) Negative v 3. f;(A) 50 Positive v 4. fy(B) (b) Suppose a point P in the xy-plane moves in a straight line from the green point A to the red point B. Positive to negative v 1. Does the sign of fy(P) change from positive to negative, negative to positive, or is there no OB change in sign? Negative to positive v 2. Does the sign of f.(P) change from positive to negative, negative to positive, or is there no change in sign?

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