f(x, y) = xey (a) Evaluate f(1, 2). 7.39   Correct: Your answer is correct. Evaluate f(1.05, 2.1). 8.57   Correct: Your answer is correct. Calculate Δz. 1.18   Correct: Your answer is correct. (b) Use the total differential dz to approximate Δz. Δz =

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