Use a graphing calculator or a computer program for the simplex method to solve this linear programming problem. x 1 x 2 x 3 x 4 s 1 s 2 s 3 0 0 .375 .625 1 0 0 530 0 .75 .5 .375 0 1 0 580 1 .25 .125 0 0 0 1 290 negative 110 negative 90 negative 85 negative 75 0 0 0 0