document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=620400>Question 620400</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The equation R=-0.028t+20.8 can be used to predict the world record in the 200-m dash, where R is the record in seconds and t is the number of years since 1920. In what year will the record be 18.0 seconds?\r<BR>\n" );
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document.write( "I dont even know where to begin to find what year the record will be 18.0 seconds. This word problem really confused me bad... your time and efforts will be greatly appreciated in this word problem...Thank you very much for your help. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #390159 by </B><A HREF=/tutors/aboutme.mpl?userid=MathTherapy><B>MathTherapy(10552)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathTherapy><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=MathTherapy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=390159\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "The equation R=-0.028t+20.8 can be used to predict the world record in the 200-m dash, where R is the record in seconds and t is the number of years since 1920. In what year will the record be 18.0 seconds?\r<BR>\n" );
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document.write( "R(t) = - 0.028t + 20.8<BR>\n" );
document.write( "18 = - 0.028t + 20.8<BR>\n" );
document.write( "0.028t = 20.8 – 18<BR>\n" );
document.write( "0.028t = 2.8<BR>\n" );
document.write( "t, or time for the record to be 18 secs = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2.8%2F0.028 ALIGN=MIDDLE  ALT=\"2.8%2F0.028\"   DISABLED_style= \"max-width:90%; height:auto;\" >, or 100 years\r<BR>\n" );
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document.write( "100 years from the year 1920 = the <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28year_2020%29 ALIGN=MIDDLE  ALT=\"highlight_green%28year_2020%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Send comments and “thank-yous” to “D” at  MathMadEzy@aol.com </SPAN>\n" );
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