Math Question: Find the 4th derivative of f(x) = 2x^3 + 5x^2 - 3x + 1.
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What is the variance of the data set {5, 8, 12, 15, 18}?
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Math question: In triangle ABC, angle A measures 60 degrees and angle B measures 80 degrees. If the angle bisector of angle A intersects side BC at point P, and BP measures 10 units, what is the length of CP?