- What is the vertex of the parabola f(x) = -5x^2+4x+1?

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Find the maximum rate of change of f(x,y,z) = x + y/z at the point (-2, 3, 2) and the direction in which it occurs.? Explain what people can do to prepare for an earthquake (safety).include what people should put in an earthquake survival kit.? Do solutions have a definite composition? Can solutions be separated by a physical method? Find the directional derivative of f(x,y) = x/y at the point (2, -4)?