- What are the aims of discovering past by excavation?

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Need help with chemistry homework i dont know how to work any of them!!? According to Ogilby, the astronomer, what were the chances of anything coming from Mars? How many grams (to the nearest 0.1 g) of CaBr2 are required to prepare 746 mL of a 0.406 M solution of CaBr2? Solve using the elimination method.
8x−y=16
4x+y=20
(FIND THE ORDERED PAIR)? Solve by the elimination method.
9x−y=35 , x+8y=12 (FIND THE ORDERED PAIR)?