What is the median of a set of numbers: 2, 4, 7, 9, 10, 13, 15, 17, 18, 20?
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Question: What is the derivative of f(x) = 3x^4 - 5x^2 + 2x - 7?
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Math question: Given a triangle with a side length of 10, an angle of 45 degrees, and opposite side 'x', find the value of x using trigonometry ratio formulas.