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A proof may contain which of the following? Find all integers for k for which 4x^2+kxy-9y^2 can be factored. show all work? The graph of f(x)=3(x-4) is the graph of a parabola.? A soccer ball is kicked from the playing field at a 45 degree angle. If it is in the air for 3 s, what is the initial vertical velocity? Solve using the Substitution method 2x+3y=4 , 2x-3y=-4 (SHOW YOUR STEPS)?

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