We learned about matrices. We learned how to add, subtract, multiply, and find the inverse and/or determinate. To add matrices, you have to have same dimension matrices, ie: 2x2 + 2x2. (subtraction follow this also) Multiplication requires the last number of the first dimension, 2x3, and the first number of the second dimension, 3x2, to be the same.
To find inverses: the inverse of A = 1/|A| * [d -b(first row) -c a(second row)]
For determinates: ad-bc
That's pretty much it :D
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