What is the variance of a data set containing 3, 5, 7, and 9?
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What is the common radian measure of an angle in a right-angled triangle when given the measure in degrees?
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What is the equation of an ellipse with a vertical major axis and center at (0,0), when the distance from the center to one vertex is 3, and the distance from the center to one co-vertex is 2?