document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=233856>Question 233856</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The height in feet of a glof ball hit from an elevated tee box is given by h(t) = -16t^2 + 60t + 25 where t represents the time in seconds the ball is in flight. \r<BR>\n" );
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document.write( "determine the time interval for which the ball is above 25 ft. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #172523 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=172523\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The height in feet of a glof ball hit from an elevated tee box is given by h(t) = -16t^2 + 60t + 25 where t represents the time in seconds the ball is in flight. <BR>\n" );
document.write( "determine the time interval for which the ball is above 25 ft.<BR>\n" );
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document.write( "It's at 25 feet at t = 0<BR>\n" );
document.write( "h(t) = -16t^2 + 60t + 25<BR>\n" );
document.write( "25 = -16t^2 + 60t + 25<BR>\n" );
document.write( "16t^2 = 60t<BR>\n" );
document.write( "t = 60/16<BR>\n" );
document.write( "t = 15/4 seconds to return to 25 ft<BR>\n" );
document.write( "The time above 25 ft is<BR>\n" );
document.write( "15/4>t>0 seconds<BR>\n" );
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