- Find the equation of a parabola whose vertex is at the origin and whose focus is (0,-2).?

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Benefits of using fractional distillation? Does anything actually turn the O2 to the O3? In dimensions, If a measurement is 5.25x5.5 would 5.25 be the width or the height? The half life of a radioactive element is 20 years. What percent of an initial amount of this element will remain after 40 years ? Find the sum to n terms of the series, 2+4(1/5)+6(1/5)²...,and deduce the sum to infinity.?