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A square and an equilateral triangle each have sides of length 5. What is the ratio of the area of the square to the area of the triangle

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If x + 2y = a and x - 2y = b, which of the following expressions is equal to xy

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In the figure above, the area of square ABCD, is 100, the area of triangle DEC is 10, and EC = ED. What is the distance from A to E

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