What is the variance of a dataset consisting of 10, 15, 20, 25, and 30?
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Math question: For the cubic function f(x) = x^3, find the value of x at which the function attains its maximum or minimum value within the domain [-10,10].
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What is the equation of a hyperbola with its center at (0,0), transverse axis along the y-axis, and vertices at (0, -5) and (0, 5)?