Use the simplex method to maximize the given function. Assume all variables are nonnegative. Maximize f = 7x + 18y + 4z subject to the following. 3x  +  5y  +  4z  ≤  30 3x  +  2y      ≤  4 x  +  2y      ≤  8 (x, y, z) =         f =

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