document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=872775>Question 872775</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the height in feet above the ground of an arrow can be modeled by y=-16x^2+62x+4. Can the arrow pass over a tree that is 68 feet tall? why or why not? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #526395 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=526395\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the height in feet above the ground of an arrow can be modeled by y=-16x^2+62x+4. Can the arrow pass over a tree that is 68 feet tall? why or why not?<BR>\n" );
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document.write( "y=-16x^2+62x+4<BR>\n" );
document.write( "complete the square:<BR>\n" );
document.write( "y=-16(x^2-(62/16)x+(62/32)^2)+16(62/32)^2+4<BR>\n" );
document.write( "y=-16(x-(62/32))^2+16(62/32)^2+4<BR>\n" );
document.write( "y=-16(x-1.9375)^2+64.0625<BR>\n" );
document.write( "This is an equation of a parabola that opens downwards with vertex at(1.9375, 64.0625)<BR>\n" );
document.write( "maximum height of the arrow&#8776;64 ft<BR>\n" );
document.write( "therefore, arrow cannot pass over a tree that is 68 feet tall<BR>\n" );
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