Use the contour plot of f(x, y) shown at right to answer the fol- lowing questions. (a) Which of these is the best estimate for fr(2, 1)? A. -2.5 B. -1.5 C. -0.5 D. 0.5 E. 1.5 F. 2.5 (b) What is the sign of fay (2, 1) at P? A. Positive B. Negative C. Zero 2 1 0 1 2 3 f = -3 f = -2 f=-1 f=0 f = 1 f = 2 f=3

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