What is the variance of the data set {5, 7, 9, 12, 15}?
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What is the value of f(x) = c, where c is a constant, when x = 5?
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Question: Consider a circle function with the equation x^2 + y^2 = r^2. Find the value of y when x = 3, given that r = 5 and x and y are both positive integers.