document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=943283>Question 943283</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modeled by the quadratic function h(t) = -16t^2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the nearest hundredth. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #575061 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=575061\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 22 = -16t^2 + 42t + 3.75<BR>\n" );
document.write( "-16t^2 + 42t + 3.75 - 22 = 0<BR>\n" );
document.write( "-16t^2 + 42t - 18.25 = 0<BR>\n" );
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document.write( "the above quadratic equation is in standard form, with a=-16, b=42 and c=-18.25<BR>\n" );
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document.write( "to solve the quadratic equation, by using the quadratic formula, copy and paste this:<BR>\n" );
document.write( "-16 42 -18.25<BR>\n" );
document.write( "into this solver: https://sooeet.com/math/quadratic-equation-solver.php<BR>\n" );
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document.write( "the quadratic has two real roots at:<BR>\n" );
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document.write( "t = 0.549590274<BR>\n" );
document.write( "t = 2.07540973<BR>\n" );
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document.write( "answer:<BR>\n" );
document.write( "he is at least 22 ft above the ground from t=0.55 and t=2.08 seconds<BR>\n" );
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document.write( "Free algebra tutoring live chat:<BR>\n" );
document.write( "https://sooeet.com/chat.php?gn=algebra<BR>\n" );
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document.write( "Solve and graph linear equations:<BR>\n" );
document.write( "https://sooeet.com/math/linear-equation-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve quadratic equations with quadratic formula:<BR>\n" );
document.write( "https://sooeet.com/math/quadratic-formula-solver.php<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Solve systems of linear equations up to 6-equations 6-variables:<BR>\n" );
document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php<BR>\n" );
document.write( "--- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );