document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1025687>Question 1025687</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The height of a ball thrown straight up into the air can be modeled by<BR>\n" );
document.write( "h(t) = &#8722;16t2 + 30t + 3.5\r<BR>\n" );
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document.write( "where h(t) is the height of the ball in feet t seconds after it is thrown.\r<BR>\n" );
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document.write( "When will the ball be at a height of 15 feet? (Round your answers to two decimal places. Include units with your numerical answers.)\r<BR>\n" );
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document.write( "The ball is at a height of 15 feet_______(smaller value) after being thrown and again_______(larger value) after being thrown. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #640974 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=640974\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h(t) = &#8722;16t^2 + 30t + 3.5 <BR>\n" );
document.write( "15=-16t^2+30t+3.5<BR>\n" );
document.write( "16t^2-30t+11.5=0<BR>\n" );
document.write( "t=(1/32)(30 +/- sqrt (900-736)); sqrt (164)=12.81)<BR>\n" );
document.write( "t=(1/32)(30+/-12.81)<BR>\n" );
document.write( "t=(1/32)(42.81) and (1/32)(17.19)<BR>\n" );
document.write( "t=1.34 sec and t=0.537 sec<BR>\n" );
document.write( "in order at 0.537 and 1.34 sec.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28300%2C200%2C-2%2C4%2C-10%2C25%2C-16x%5E2%2B30x%2B3.5%29 ALIGN=MIDDLE  ALT=\"graph%28300%2C200%2C-2%2C4%2C-10%2C25%2C-16x%5E2%2B30x%2B3.5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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