document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=169698>Question 169698</A>: <I><SPAN STYLE=\"word-break: break-all;\"> could you please solve the following question,<BR>\n" );
document.write( "a ball is thrown up into the air. its height h, in meters, after t seconds is <BR>\n" );
document.write( "h=-4.9t^2+38t+1.75.<BR>\n" );
document.write( "for what length of time is the ball above 50 m?<BR>\n" );
document.write( "and thank you,<BR>\n" );
document.write( "i will be waiting for the solution,<BR>\n" );
document.write( "and thank you again,<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #125083 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=125083\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a ball is thrown up into the air. its height h, in meters, after t seconds is <BR>\n" );
document.write( "h=-4.9t^2+38t+1.75.<BR>\n" );
document.write( "for what length of time is the ball above 50 m?<BR>\n" );
document.write( "----------------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28400%2C300%2C-10%2C20%2C-10%2C120%2C-4.9x%5E2+%2B+38x+%2B+1.75%2C50%29 ALIGN=MIDDLE  ALT=\"graph%28400%2C300%2C-10%2C20%2C-10%2C120%2C-4.9x%5E2+%2B+38x+%2B+1.75%2C50%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "----------------------------------<BR>\n" );
document.write( "-4.9x^2 + 38x + 1.75 = 50<BR>\n" );
document.write( "-4.9x^2 + 38x - 48.25 = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = [-38 +- sqrt(38^2 - 4*-4.9*-48.25)]/-9.8<BR>\n" );
document.write( "x = 1.59973..; x = 6.1554<BR>\n" );
document.write( "----------------------------<BR>\n" );
document.write( "Total time at or above 50 m: 6.1554-1.59973 = 4.55564.. seconds<BR>\n" );
document.write( "===============================================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );