A contour diagram of z = f(x, y) is given in the figure. Determine whether fx, fy, fxx and fyy are positive, negative, or zero at the points P, Q, R, and S. ? ? ? ? ? ? ? ? ? ? 1. fx at the point R. 2. fx at the point S. 3. fyy at the point S. 4. fy at the point P. 5. fy at the point S. 6. fxx at the point R. 7. fxx at the point Q. 8. fy at the point R. 9. fyy at the point Q. 10. fx at the point P.

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A: We can make it easier for you.

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