Math Question: What is the value of f(x) for a constant function f(x) = c, if c is equal to 5?
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What is the amplitude of the tangent function f(x) = tan(x)?
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Question: What is the equation of a quadratic function that opens upward, has a vertex at (0, 5), and passes through the point (2, 13)? Provide the equation in vertex form.