Write a math question for the theme "Characteristics of constant function f(x)=c": Find the value of c if the constant function f(x)=c passes through the point (5, 9).
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Math Question: Find the derivative of f(x) = 3x^4 + √(5x) - e^(2x) with respect to x.
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Math question: Solve the inequality 3x - 5 < 7 for x.