- State the vertex, focus and directrix of the parabola with equation: x^2 - 2x - 15 = -8y?

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15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? How many edges in a circle? Find a positive angle, less than 360 degrees, that is coterminal with a 1715 degree angle. Please show steps!!? Solve the equation for x.
e^x = 85? If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3?