What is the equation of a parabola with a vertex at (2, -3) and a focus at (4, -3)?
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What is the equation of the exponential function that has a horizontal asymptote at y=3, passes through the point (2,7), and has a y-intercept at (0,1)?
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What is the limit of (x^2 + 3x - 2) as x tends to 2?