document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=174143>Question 174143</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When a ball is thrown, its height in feet h  after t seconds is given by the equation \r<BR>\n" );
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document.write( "h=vt-16t^2<BR>\n" );
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document.write( "where v is the initial upwards velocity in feet per second. If v=15 feet per second, find all values t of  for which h=3 feet. Do not round any intermediate steps. Round your answer to 2 decimal places. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #129070 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=129070\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> When a ball is thrown, its height in feet h after t seconds is given by the equation <BR>\n" );
document.write( "h=vt-16t^2\r<BR>\n" );
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document.write( "where v is the initial upwards velocity in feet per second. If v=15 feet per second, find all values t of for which h=3 feet.<BR>\n" );
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document.write( "h(t) = vt-16t^2<BR>\n" );
document.write( "3 = 15t - 16t^2<BR>\n" );
document.write( "16t^2 - 15t + 3 = 0<BR>\n" );
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document.write( "Use the Quadratic formula to solve for \"t\":\r<BR>\n" );
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document.write( "t = [15 +- sqrt(225 - 4*16*3)]/32\r<BR>\n" );
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document.write( "t = [15 +- sqrt(33)]/32\r<BR>\n" );
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document.write( "t = [15 + sqrt(33)]/32 = 0.64827 seconds\r<BR>\n" );
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document.write( "or\r<BR>\n" );
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document.write( "t = [15 - sqrt(33)]/32 = 0.28923 seconds<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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