document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=129431>Question 129431</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I can not figure this out. Please help me, I just can not get word problems correct. Thanks so much for your help. I need this help by tomorrow please.<BR>\n" );
document.write( "In 1991, the life expectancy of males in a certain country 68.9 years. In 1997 it was 71.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1991.<BR>\n" );
document.write( "The linear function that fits the data is. E(t)= _t + _ ? Round answer to the nearest tenth.<BR>\n" );
document.write( "Also, Use the function to predict the life expectancy of males in 2009. <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #94546 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=94546\">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 68.9 years. In 1997 it was 71.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1991.<BR>\n" );
document.write( "The linear function that fits the data is. E(t)= _t + _ ? Round answer to the nearest tenth.<BR>\n" );
document.write( "Also, Use the function to predict the life expectancy of males in 2009. <BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "I'm sure you know how to find the equation of a line if you have two points.<BR>\n" );
document.write( "Well, in this problem you are given two points: (0,68.9) and (6,71.7)<BR>\n" );
document.write( "slope = (71.7-68.9) / (6-0) = 0.466667<BR>\n" );
document.write( "Form is E(t) = slope(years since 1991) + b<BR>\n" );
document.write( "Solve for \"b\"<BR>\n" );
document.write( "68.9 = 0.466667*0 + b<BR>\n" );
document.write( "b= 68.9<BR>\n" );
document.write( "--------------<BR>\n" );
document.write( "EQUATION:<BR>\n" );
document.write( "E(t) = 0.466667t + 68.9<BR>\n" );
document.write( "===========================<BR>\n" );
document.write( "Use the function to predict the life expectancy of males in 2009.<BR>\n" );
document.write( "E(2009-1991) = 0.46666667*18 + 68.9<BR>\n" );
document.write( "E(18) = 77.3 yrs.<BR>\n" );
document.write( "=====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );