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1.find the equation of the ellipse with center (0,0), focus at (4,0), vertices at (7,0) and...

1.find the equation of the ellipse with center (0,0), focus at (4,0), vertices at (7,0) and major axis on the x-axis
2.A bridge is built in the form of a semi-elliptical arch. It has an extension of 120 feet. The height of the arch that is 27 feet from its center is 9 feet. Find the height of the arch at its center.

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