document.write( "Question 1186849: A railroad crosses a highway over an arch a cross section of which is an semi-ellipse 42 meters long and 12 meters high. there are vertical supports at interval of 7 meters.find the heights and supports.\r
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Algebra.Com's Answer #849339 by ikleyn(52800) $\"\"$ $\"About$

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\n" ); document.write( "A railroad crosses a highway over an arch a cross section of which is an semi-ellipse 42 meters long
\n" ); document.write( "and 12 meters high. there are vertical supports at interval of 7 meters. find the heights and supports.
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document.write( "An equation of the ellipse is\r\n" );
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document.write( "     +  = 1.\r\n" );
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document.write( "From equation, express\r\n" );
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document.write( "    y = .\r\n" );
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document.write( "The supports are at x = -14, -7, 0, 7, 14.\r\n" );
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document.write( "Therefore, what you need is to calculate this sum\r\n" );
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document.write( "    Sum =  +  +  +  + .\r\n" );
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document.write( "The sum is  52.52  meters  (rounded).    ANSWER\r\n" );
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