Question: In Problems, use the simplex method or Excel. Assume that all variables are nonnegative. Maximize f = 2x - y + 4z subject to x

In Problems, use the simplex method or Excel. Assume that all variables are nonnegative.

Maximize f = 2x - y + 4z subject to
                                 x + y + z ≤ 8
                                 x - y + z ≥ 4
                                 x + y - z ≥ 2

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