The Gateway Arch in St. Louis is often mistaken to be parabolic in shape. In fact, it

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The Gateway Arch in St. Louis is often mistaken to be parabolic in shape. In fact, it is a catenary, which has a more complicated formula than a parabola. The Arch is 630 feet high and 630 feet wide at its base.

(a) Find the equation of a parabola with the same dimensions. Let x equal the horizontal distance from the center of the arch.

(b) The table below gives the height of the Arch at various widths; find the corresponding heights for the parabola found in (a).image

(c) Do the data support the notion that the Arch is in the shape of a parabola?

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