document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=148397>Question 148397</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Here's a hard one...HELP\r<BR>\n" );
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document.write( "In 1991, th elife expectancy of males in a certain country was 70.4 years.  In 1998, it was 74.2 years.  Let E represent the life expectancy in year t and let t represent the number of years since 1991.\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( "E(t) = ??t + ??<BR>\n" );
document.write( "(round to the nearest tenth)<BR>\n" );
document.write( "Use the function to predict the life expectancy of males in 2003.<BR>\n" );
document.write( "E(12)=???<BR>\n" );
document.write( "(round to the nearest tenth)<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #108769 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=108769\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In 1991, the life expectancy of males in a certain country was 70.4 years. <BR>\n" );
document.write( "In 1998, it was 74.2 years. <BR>\n" );
document.write( "Let E represent the life expectancy in year t and let t represent the number of years since 1991<BR>\n" );
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document.write( "You have two points relating t and E: (0,70.4) and (7,74.2)<BR>\n" );
document.write( "slope = (74.2-70.4)/7 = 3.8/7 = 19/35<BR>\n" );
document.write( "intercept: 70.4 <BR>\n" );
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document.write( "The linear function E(t) that fits the data is?? <BR>\n" );
document.write( "E(t) =(19/35)t + 70.4<BR>\n" );
document.write( "(round to the nearest tenth)\r<BR>\n" );
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document.write( "Use the function to predict the life expectancy of males in 2003.<BR>\n" );
document.write( "E(12)= (19/35)*12 + 70.4 = 76.9 years<BR>\n" );
document.write( "(round to the nearest tenth)<BR>\n" );
document.write( "===================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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