document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=135370>Question 135370</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have no Idea were to start with this problem, can you please help with this function?<BR>\n" );
document.write( "In 1990, the life expectancy of males in a certain country was 70.2 years. In 1997, it was 72.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1990.\r<BR>\n" );
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document.write( "The linear function E(t) that fits the data is\r<BR>\n" );
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document.write( "so fair I came up with <BR>\n" );
document.write( "E(t)= _t +_.\r<BR>\n" );
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document.write( "please help!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #99212 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=99212\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In 1990, the life expectancy of males in a certain country was 70.2 years. In 1997, it was 72.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1990. <BR>\n" );
document.write( "The linear function E(t) that fits the data is <BR>\n" );
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document.write( "You have two points relating (t,E(t)): (90,70.2) and (97,72.7)<BR>\n" );
document.write( "slope = (72.7-70.2)/(7-0) = 2.5/7 = 5/14<BR>\n" );
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document.write( "Equation form is y = mx+b; you have x,y,and m; solve for \"b\" as follows:<BR>\n" );
document.write( "70.2 = (5/14)*0 + b<BR>\n" );
document.write( "b = 70.2<BR>\n" );
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document.write( "EQUATION:<BR>\n" );
document.write( "E(t)= (5/14)t + 70.2<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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