What is the slope of a line passing through the points (2, 4) and (6, 8)?
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What is the equation of an ellipse with a major axis parallel to the x-axis, a center at (h, k), semi-major axis of length a, and semi-minor axis of length b?
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What is the value of f(x) = 2x^3 - 5x^2 + 7 when x = 4?