document.write( "Question 744051: A satellite dish has a parabolic cross section and is 6 ft deep. The focus is 4 ft from the vertex. Find the width of the satellite dish at the opening. Round your answer to the nearest foot. \n" ); document.write( "
Algebra.Com's Answer #453301 by lwsshak3(11628)\"\" \"About 
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A satellite dish has a parabolic cross section and is 6 ft deep. The focus is 4 ft from the vertex. Find the width of the satellite dish at the opening. Round your answer to the nearest foot.
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\n" ); document.write( "place vertex at (0,0)
\n" ); document.write( "basic equation: x^2=4py
\n" ); document.write( "p=4 (distance from vertex to focus)
\n" ); document.write( "4p=16
\n" ); document.write( "equation: x^2=16y
\n" ); document.write( "y=6 at ends of parabolic cross section
\n" ); document.write( "x^2=16*6=96
\n" ); document.write( "x=±√96
\n" ); document.write( "width of the satellite dish at the opening=2*√96≈20 ft \n" ); document.write( "
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