document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=174035>Question 174035</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ok this problem is really confusing, I feel like I might know what to do but I cannot remember the formula to do it.<BR>\n" );
document.write( "In 1992, the life expectancy of males in a certain country was 61.7 years. In 1997, it was 64.5 years Let E express the life expectancy in year t and let t represent the number of years since 1992.<BR>\n" );
document.write( "The linear function E(t) that fits the data is <BR>\n" );
document.write( "E(t)=__t+__<BR>\n" );
document.write( "Use the function to predict the life expectancy of males in 2005.<BR>\n" );
document.write( "E(13)=? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #128949 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=128949\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In 1992, the life expectancy of males in a certain country was 61.7 years. In 1997, it was 64.5 years Let E express the life expectancy in year t and let t represent the number of years since 1992.<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "You have two points of the form (t,E)<BR>\n" );
document.write( "One is (0,61.7) ; this is the intercept for the equation.<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "The other is (5,64.5)<BR>\n" );
document.write( "-------------------------<BR>\n" );
document.write( "slope = (64.5 - 61.7)/(5-0)  = 2.8/5 = 0.56<BR>\n" );
document.write( "------<BR>\n" );
document.write( "The linear function E(t) that fits the data is <BR>\n" );
document.write( "E(t)=_0.56t+61.7<BR>\n" );
document.write( "------------------<BR>\n" );
document.write( "Use the function to predict the life expectancy of males in 2005.<BR>\n" );
document.write( "E(13) = 0.56*13 + 61.7 = 68.98 years<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );