document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=671667>Question 671667</A>: <I><SPAN STYLE=\"word-break: break-all;\">  If a stone is tossed from the top of a 230 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 230, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth’s place; include units in your answer. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #417521 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=417521\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> h(t) = -9.8t^2 – 10t + 230, <BR>\n" );
document.write( "When the stone hits the ground h(t)=0<BR>\n" );
document.write( "-9.8t^2 – 10t + 230 = 0 <BR>\n" );
document.write( "This is a quadratic equation. Use the formula method.\r<BR>\n" );
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document.write( "here a=-9.8, b=-10, c=230<BR>\n" );
document.write( "a=	-9 4/5	b=	-10	c=	230			<BR>\n" );
document.write( "								<BR>\n" );
document.write( "b^2-4ac=	100	-	-9016					<BR>\n" );
document.write( "b^2-4ac=	9116		<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%099116%09%29 ALIGN=MIDDLE  ALT=\"sqrt%28%099116%09%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >=	95.48		<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29 ALIGN=MIDDLE  ALT=\"x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >								<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29 ALIGN=MIDDLE  ALT=\"x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >								<BR>\n" );
document.write( "x1=(	10	+	95.48	)/	-19.6			<BR>\n" );
document.write( "x1=	-5.38							<BR>\n" );
document.write( "x2=(	10	-	95.48	)/	-19.6			<BR>\n" );
document.write( "x2=	4.36	seconds						<BR>\n" );
document.write( "Ignore negative value								<BR>\n" );
document.write( "x	=	-5.38	mph					<BR>\n" );
document.write( "								<BR>\n" );
document.write( "				<BR>\n" );
document.write( "m.ananth@hotmail.ca								\r<BR>\n" );
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document.write( " </SPAN>\n" );
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