document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=26760>Question 26760</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Need some help please.\r<BR>\n" );
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document.write( "Question : The world record for the mile was 4 minutes and 10 seconds in 1923 and 3 minutes and 49 seconds in 1975.\r<BR>\n" );
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document.write( "a) Assuming that the record improves in a linear fashion, write an equation to predict the mile world record (in seconds) for a given year.\r<BR>\n" );
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document.write( "b) From your equation what should the world record have been in 1999?  How does it compare to the actual world's record of 3 minutes and 43.13 seconda. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #14559 by </B><A HREF=/tutors/aboutme.mpl?userid=wuwei96815><B>wuwei96815(245)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=wuwei96815><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=14559\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> From the information given we see that the record went down 21 seconds in 52 years (1975-1923 = 52 and 4:10-3:49 = 21).  Therefore, the yearly loss is 21/52 or 0.4 seconds per year.\r<BR>\n" );
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document.write( "a)World record = 4:10 - 0.4(given year-1923)\r<BR>\n" );
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document.write( "b) World record for 1999 = 4:10 - 0.4(1999-1923) = 4:10 - 30.4 seconds = 3:39.6<BR>\n" );
document.write( "   This is very close to the actual record of 3:43.13   </SPAN>\n" );
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