Which is the graph of ? a. c. b. d. Please select the best answer from the choices provided

Find the foci for the ellipse given by the equation:

Which is the graph of ?a.c.b.d.

An arched footbridge over a 100-foot river is shaped like half an ellipse. The maximum height of the bridge over the river is 20 feet. Find the height of the bridge over a point in the river exactly 25 feet from the center of the river.
A furniture maker has a rectangular block of wood that measures inches by 25 inches. He wants to cut it to make the largest elliptical table top possible. Find an equation of the ellipse he can use, placing the center at the origin and the major axis on the x-axis. Locate the approximate foci of the ellipse.

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