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1. Use Cramer's Rule to solve the following system of equations: 3x + y + 5z = 15 3y = 9 2x + 4z =

1. Use Cramer's Rule to solve the following system of equations: 3x + y + 5z = 15 3y = 9 2x + 4z = 13 2. Find the second order partial derivatives with respect to x and y of z(x, y) = Invxy 3 -2 + 2xy

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