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Find the directional derivative of f(x,y) = x/y at the point (2, -4)? What is the solution set for x^2 + 4 = 6x? What is the concentration of As if 5 g of As is found in 10,000 L of water? Explain what people can do to prepare for an earthquake (safety).include what people should put in an earthquake survival kit.? A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4?