document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=976217>Question 976217</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rocks falls from a tower that is 320 ft high.  As it is falling, it height is given by the formula h=320--16t^2.  How many seconds (in tenths) will it take for the rock to hit the ground? h=0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #597858 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=597858\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h+=+320-16t%5E2 ALIGN=MIDDLE  ALT=\"h+=+320-16t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0+=+320-16t%5E2 ALIGN=MIDDLE  ALT=\"0+=+320-16t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Plug in <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h+=+0 ALIGN=MIDDLE  ALT=\"h+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=16t%5E2+=+320 ALIGN=MIDDLE  ALT=\"16t%5E2+=+320\"   DISABLED_style= \"max-width:90%; height:auto;\" > Add <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=16t%5E2 ALIGN=MIDDLE  ALT=\"16t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > to both sides.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5E2+=+320%2F16 ALIGN=MIDDLE  ALT=\"t%5E2+=+320%2F16\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide both sides by 16.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t%5E2+=+20 ALIGN=MIDDLE  ALT=\"t%5E2+=+20\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+sqrt%2820%29 ALIGN=MIDDLE  ALT=\"t+=+sqrt%2820%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Apply the square root to both sides\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+sqrt%284%2A5%29 ALIGN=MIDDLE  ALT=\"t+=+sqrt%284%2A5%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+sqrt%284%29%2Asqrt%285%29 ALIGN=MIDDLE  ALT=\"t+=+sqrt%284%29%2Asqrt%285%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+2%2Asqrt%285%29 ALIGN=MIDDLE  ALT=\"t+=+2%2Asqrt%285%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+4.47213595499958 ALIGN=MIDDLE  ALT=\"t+=+4.47213595499958\"   DISABLED_style= \"max-width:90%; height:auto;\" > Use a calculator here\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t+=+4.5 ALIGN=MIDDLE  ALT=\"t+=+4.5\"   DISABLED_style= \"max-width:90%; height:auto;\" > Round to the nearest tenth\r<BR>\n" );
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document.write( "It will take approximately <font size = 5 color=\"red\">4.5 seconds</font> for the object to fall 320 ft. This is ignoring air resistance.\r<BR>\n" );
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document.write( "Jim\r<BR>\n" );
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