What is the volume of a rectangular solid with length 5cm, width 10cm, and height 15cm?
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Find the roots of the quadratic equation x^2 - 5x + 6 = 0.
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What is the equation of an ellipse with its major axis parallel to the y-axis, center at (2, -3), a vertical distance of 6 units, and a horizontal distance of 10 units?