document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=206213>Question 206213</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This problem with linear functions is getting me confused, can you help me please? I appreciate it.\r<BR>\n" );
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document.write( "In 1991, the life expectancy of males in a certain country was 66.3 years. In 1995, it was 68.9 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 E(t) that fits the data is E(t)=___t  + ____ (round to the nearest tenth) <BR>\n" );
document.write( "Use the function to predict the life expectancy of males in 2008. E(17)=___<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 #155801 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=155801\">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 66.3 years. In 1995, it was 68.9 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 E(t) that fits the data is E(t)=___t + ____ (round to the nearest tenth) <BR>\n" );
document.write( "Use the function to predict the life expectancy of males in 2008. E(17)=___<BR>\n" );
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document.write( "You have two points relating year and life expectancy: (0,66.3) and (4,68.9)<BR>\n" );
document.write( "slope: (68.9-66.3)/4 = 0.65<BR>\n" );
document.write( "intercept: E(0) = 66.3<BR>\n" );
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document.write( "Equation: E(t)=0.65t+66.3<BR>\n" );
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document.write( "E(17) = 0.65*17+66.3 = 77.35<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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