Ameteor crashed onto a planet and caused a crater that was 507.692 deep. use the table of facts to find the depth of the crater in inches. round your answer to the nearest tenth

answer: 19987.9

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 Draw a picture of the downward-facing parabola, and of a rectangle of the type described. Let (x,y) be the upper right-hand corner of the rectangle. Then by symmetry, the base of the rectangle has length 2x, and the height is y, that is, 12−x2. So the area A(x) of the rectangle is given by A(x)=2x(12−x2).