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What are some good trades to have with a engineering/chemistry background? A right triangle has acute angles of 30 degrees and 60 degrees. The hypotenuse has length 3. What are the length of the other two sides? If EF = 2x + 7 and GH = 5x -1, what is EF? Air contains nitrogen and oxygen in the ratio 4 is to 1 the average molecular weight of Air is? Can phosphorus be used for bombs/explosives?