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Please HELP!!!!!! Two-digit natural numbers are formed, with replacement, from the digits 0 through 9. How many numbers are greater than 57? Can solutions be separated by a physical method? 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.? F(x, y) = sin(2y/x) and u is unit vector in direction (1, 2).? How do I make my brain smarter for math and stuff like we don't know?