Level curves for a continuous function z = f(x, y) are sketched in the below figure for z = 0, z = 10 and z 20. Assuming the z-values change smoothly between level curves, estimate the values of fx(x, y) and fy(x, y) at points labeled A, B and C. Be sure to explain your process. 5 3 2 23 20 45 סן I x

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