Question: What is the variance of the set {5, 8, 12, 15, 20}?
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What is the solution set for the inequality 3x + 5 > 20?
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Math Question: Consider a quadratic function with the graph of a parabola opening upward. Its vertex is located at (-2, 5) and one of its roots is x = 3. Find the equation of this quadratic function.