Math Question: Find the missing side length in a right triangle with an adjacent side of 5 units, an angle of 30 degrees, and an opposite side length of x.
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What is the derivative of the function f(x) = 3x² + 2x - 1?
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What is the mean, mode, median, range, and average of the data set: 7, 9, 12, 12, 15, 17, 18, 19, 21?