In Exercises 13–21, reduce [A|I] to find A-. In each case, check your calculations by multiplying the given matrix by the derived inverse. 13. 1 1 14. 2 3 2 3 6 7 15. 1 16. 1 -2 11 2 1 13-15 5 17. 100 18. Г 1 3 5 1 0 01 4 3 4 1 0 2 7 19. 142 20. 1 -2 2 1 0 2 1 1-1 5 3 5 3 2 -2 11 4. 028 1

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