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4. Given the function below, find the following exact values: 2x3 3y z =f(x, y) = y a. f (2, 4) (1) b. f (-1, 0) (1) c. fy (2, 4) and fyy ( 2, 4) (3d. Based on the values in part c, select the shape that corresponds to the orientation of the function's surface at f (2, 4) in the indicated direction. Circle or underline your selection. (1)