document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=34797>Question 34797</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This is from a worksheet from Glencoe Algebra 1.<BR>\n" );
document.write( "Mr Adim's science class launched a toy rocket from ground level with an initial  upward velocity of 60 feet per second. The height h of the rocket in feet above the ground after t seconds is modeled by the equation <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h=60t-16t%5E2 ALIGN=MIDDLE  ALT=\"h=60t-16t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >.How long was the rocket in the air before it returned to the ground? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #21038 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=21038\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What you are really trying to ascertain is...when will the height of the rocket be at zero feet - again?<BR>\n" );
document.write( "You can find this by setting the equation h (height) = 0 and solving for the time (t).\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0+=+60t+-+16t%5E2 ALIGN=MIDDLE  ALT=\"0+=+60t+-+16t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Factor out a t.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0+=+t%2860+-+16t%29 ALIGN=MIDDLE  ALT=\"0+=+t%2860+-+16t%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Apply the zero products principle.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+0 ALIGN=MIDDLE  ALT=\"t+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > and/or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60+-+16t+=+0 ALIGN=MIDDLE  ALT=\"60+-+16t+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "When t = 0, the rocket has not yet stated its ascent.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60+-+16t+=+0 ALIGN=MIDDLE  ALT=\"60+-+16t+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > Add 16t to both sides.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60+=+16t ALIGN=MIDDLE  ALT=\"60+=+16t\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide both sides by 16.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+3.75 ALIGN=MIDDLE  ALT=\"t+=+3.75\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The rocket returns to the ground after 3.75 seconds so it was in the air for 3.75 seconds. </SPAN>\n" );
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