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Can Ghosts appear in a photo then dissappear? Where does the graph of f(x)=x^2+2x-24 cross the x-axis? If 0.0037 g of gas dissolves in 0.376 l of water at 867 torr what quantity of this gas in grams will dissolve at 759 torr? Is this proof that some humans evolved from monkeys? How do you divide square roots?