document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1180068>Question 1180068</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An aquarium wants to install a new fish tank with a parabolic glass dome fitted at its bottom to allow visitors to look at the marine life from below. The glass dome will be 60 feet in diameter and will have a depth of 4 feet. Find the equation of the parabolic cross-section of the dome.\r<BR>\n" );
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document.write( "a. y^2=16/30x<BR>\n" );
document.write( "b. y^2=4/15x<BR>\n" );
document.write( "c. y=1/225x^2<BR>\n" );
document.write( "d. y=15/14x^2<BR>\n" );
document.write( "e. y=1/15x^2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #809723 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=809723\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Good luck having a wall of an aquarium with a cross section in the shape of a parabola of the form y^2=ax....!<br><BR>\n" );
document.write( "We can quickly eliminate answer choices a. and b.<br><BR>\n" );
document.write( "Consider the vertex of the parabolic cross section to be at (0,0).  Then, since the dome has a depth of 4 feet and a width of 60 feet, the parabolic function must have the value 4 at x values of 30 and -30.<br><BR>\n" );
document.write( "Use the general form of the equation of a parabola with vertex at the origin to quickly find the answer to the problem.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y+=+ax%5E2 ALIGN=MIDDLE  ALT=\"y+=+ax%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4+=+a%2830%5E2%29 ALIGN=MIDDLE  ALT=\"4+=+a%2830%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "There is little work left to do from there....<br><BR>\n" );
document.write( " </SPAN>\n" );
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