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	Archimedes' formula for parabolic arches		2009-01-23
		La pose la question : Use calculus to verify Archimedes' formula for y=9-x^2. Prove Archimedes' formula for a general parabolic arch. Harley Weston lui répond.
	A fountain of water jets forms parabolic arches		2006-05-03
		Jennifer pose la question : Let's say in you have a fountain and the water jets form parabolic arches. The center of the fountain, being the origin of the coordinate system, it is elevated 5 feet off the ground, . The equation formed the water arch is y= -x2+4x, what is the radius of the basin needed to catch the water at ground level? Stephen La Rocque lui répond.

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