- Why do we need two different forms of linear equations?

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What is the circumference of the earth divided by 20? What happens if take 4 ambiens 5mg? Use the Cantor-Schröder-Bernstein Theorem to prove that [-1,1]~(-1,1)∪(1,2)? What is the net ionic equation for CoCl2*6H2O(aq)+C2H6O(l)->CoCl2*4H2O(aq)+2 H2O(l)+C2H6O(l)? Sodium metal reacts with hydrobromic acid: 2Na(s) + 2HBr(aq) -> 2NaBr(aq) + H2(g). Which substance is oxidized?