document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1057399>Question 1057399</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Gabe drops a hammer from an apartment that is 30 meters above the<BR>\n" );
document.write( "ground. The height of the hammer in meters, &#8462;, after t seconds is modeled by<BR>\n" );
document.write( "the function shown.<BR>\n" );
document.write( "&#8462;(t) = &#8722;t^2 &#8722; 2t + 30<BR>\n" );
document.write( "Find the approximate number of seconds it will take for the hammer to hit the<BR>\n" );
document.write( "ground. Round your answer to the nearest whole number.<BR>\n" );
document.write( "&#9633; 0<BR>\n" );
document.write( "&#9633; 5<BR>\n" );
document.write( "&#9633; 10<BR>\n" );
document.write( "&#9633; 30 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #672468 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=672468\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The hammer has to fall 30 m<BR>\n" );
document.write( "and the height, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h%28t%29+=+0+ ALIGN=MIDDLE  ALT=\"+h%28t%29+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-t%5E2+-+2t+%2B+30+=+0+ ALIGN=MIDDLE  ALT=\"+-t%5E2+-+2t+%2B+30+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "use quadratic formula<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+a+=+-1+ ALIGN=MIDDLE  ALT=\"+a+=+-1+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+b+=+-2+ ALIGN=MIDDLE  ALT=\"+b+=+-2+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+c+=+30+ ALIGN=MIDDLE  ALT=\"+c+=+30+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28-%28-2%29+%2B-+sqrt%28+%28-2%29%5E2+-+4%2A%28-1%29%2A30+%29%29+%2F+%282%2A%28-1%29%29+ ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+2+%2B-+sqrt%28+4+%2B+120+%29%29+%2F+%28-2%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28+2+%2B-+sqrt%28+4+%2B+120+%29%29+%2F+%28-2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+2+%2B-sqrt%28+124+%29+%29+%2F+%28-2%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28+2+%2B-sqrt%28+124+%29+%29+%2F+%28-2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+2+-+11.136+%29+%2F+%28-2%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28+2+-+11.136+%29+%2F+%28-2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > ( I used the negative square root to make<BR>\n" );
document.write( "the time, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" >, come out positive )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+%28+-9.136+%29+%2F+%28-2%29+ ALIGN=MIDDLE  ALT=\"+t+=+%28+-9.136+%29+%2F+%28-2%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+4.568+ ALIGN=MIDDLE  ALT=\"+t+=+4.568+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The hammer hits the ground in 5 sec<BR>\n" );
document.write( "( rounded off )<BR>\n" );
document.write( "--------------------------------------<BR>\n" );
document.write( "check:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-t%5E2+-+2t+%2B+30+=+0+ ALIGN=MIDDLE  ALT=\"+-t%5E2+-+2t+%2B+30+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-1%2A%284.568%5E2%29+-+2%2A4.568+%2B+30+=+0+ ALIGN=MIDDLE  ALT=\"+-1%2A%284.568%5E2%29+-+2%2A4.568+%2B+30+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-1%2A20.867+-+9.136+%2B+30+=+0+ ALIGN=MIDDLE  ALT=\"+-1%2A20.867+-+9.136+%2B+30+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-30.003+%2B+30+=+0+ ALIGN=MIDDLE  ALT=\"+-30.003+%2B+30+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "OK -close enough\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );