document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1172180>Question 1172180</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 2. A toy rocket is fired into the air from the top of a barn. Its height (h) above the ground in yards after t seconds is given by the function h(t)=−5t2+10t+20. Show clear solutions thanksss!\r<BR>\n" );
document.write( "\n" );
document.write( "a.	What was the maximum height of the rocket?<BR>\n" );
document.write( "b.	How long was the rocket in the air before hitting 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 #797131 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=797131\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h(t)=-5t^2+10t+20<BR>\n" );
document.write( "maximum height is where t=-b/2a or -10/-10 or 1 second after leaving.<BR>\n" );
document.write( "that is 25 feet high.<BR>\n" );
document.write( "-<BR>\n" );
document.write( "set the equation equal to 0<BR>\n" );
document.write( "-5(t^2-2t-4)=0<BR>\n" );
document.write( "t=(1/2)(2+/- sqrt 20); sqrt (20) is 2 sqrt(5), the numerator 2s cancel<BR>\n" );
document.write( "=1+/-sqrt(5)<BR>\n" );
document.write( "3.236 seconds, only positive root<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C300%2C-4%2C4%2C-10%2C30%2C-5x%5E2%2B10x%2B20%2C25%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C300%2C-4%2C4%2C-10%2C30%2C-5x%5E2%2B10x%2B20%2C25%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );