Question: In Problems 1-3, evaluate the functions at the given values of the independent variables. 1. z = x3 + 4xy + y2; x = 1,

In Problems 1-3, evaluate the functions at the given values of the independent variables.
1. z = x3 + 4xy + y2; x = 1, y = - 1
2. z = 4x2 -3xy3; x = 2, y = 2
3. z = x -y / x + y; x = 4, y = - 1

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