Solve the following problem and show your complete solutions. Explain your answer for better understanding. 13. Using the given matrices. Compute for AB. 15 71 1 A = 7 14 B = 15. Find positive integers that satisfy: 5 18 31 14. Using the given matrices, compute for tr(4E-D). 0 41 0 D= -1 -3 0, E= -4 4 31 6÷ 0 -2 x+y+z=7 x + 5y + 8z = 40. -2 11 2 2 2 0

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