1.) Determine the matrices C = A + B and D = A – B if 3 8. 5 9 -2 A = 8 -7 B -9 -1 -4 5 2 -3 -4 2.) Determine the products C = AB and D = BA if 4 3 -5 2 7 6 -7 -5 A = B = 1 -9 -13 -4 -3 3.) Solve the system of simultaneous equations using Gauss-Jordan method 20x1 - 9x2 + 15x3 = 354 - 9x1 + 16x2 - 5x3 = -275 15х 5x2 + 18x3 = 307

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