- Algebra 1 HW HELP!?

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Multiply matrices A and B of any sizes legally (no size compatibility requirment). What kind of matrix multiplication am I? How to test Petrol in blood? If you started with 3.60g of Copper and reacted it with an excess of nitric acid what mass of copper hydroxide would you expect to recover? Could a black hole exist within the event horizon of a bigger black hole? Help me to solve the following question!
Find integers x and y such that 57x+79y=17, and 400