Math question: Find the 4th derivative of y = ln(x^2 + 1).
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What is the median of the following set of numbers: 2, 5, 7, 9, 12, 15, 16?
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Math question: What is the value of 'a' in the parabola function 𝑦 = ax^2 if the vertex of the parabola is (2,6) and it passes through the point (4,12)?