document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=392523>Question 392523</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 1992, the life expetancy of males in a certain country was 70.8 years. In 1998, it was 74.5 years.  Let E represent the life expentancy in year t and let t represent the number of years since 1992.\r<BR>\n" );
document.write( "\n" );
document.write( "The linear function E(t) that fits the data is:\r<BR>\n" );
document.write( "\n" );
document.write( "Et=&#9744;t + &#9744;<BR>\n" );
document.write( "(round to the nearest tenth)\r<BR>\n" );
document.write( "\n" );
document.write( "Use the function to predict the life expectancy of males in 2009.\r<BR>\n" );
document.write( "\n" );
document.write( "E(17)=&#9744;<BR>\n" );
document.write( "(round to the nearest tenth) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #278605 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=278605\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In 1992, the life expetancy of males in a certain country was 70.8 years. In 1998, it was 74.5 years.  Let E represent the life expentancy in year t and let t represent the number of years since 1992.\r<BR>\n" );
document.write( "\n" );
document.write( "The linear function E(t) that fits the data is:\r<BR>\n" );
document.write( "\n" );
document.write( "1992 to 1998 = 6 years difference<BR>\n" );
document.write( "increase in life expectancy = 74.5-70.8=3.7<BR>\n" );
document.write( "3.7 in 6 years\r<BR>\n" );
document.write( "\n" );
document.write( "so per year increas = 3.7/6 = 0.62<BR>\n" );
document.write( "E(t) = 0.6(t)+ 70.8\r<BR>\n" );
document.write( "\n" );
document.write( "Use the function to predict the life expectancy of males in 2009.\r<BR>\n" );
document.write( "\n" );
document.write( "E(17)=0.6*17+70.8<BR>\n" );
document.write( "E(17)= 81<BR>\n" );
document.write( "...<BR>\n" );
document.write( "m.ananth@hotmail.ca </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );