document.write( "Question 250342: Can someone help please
\n" ); document.write( "In 1990, the life expectancy of males was 64.7 years, in 1995 it was 67.8 years. Let E represent the life expectancy inyear t and let t represent the number of years since 1990.
\n" ); document.write( "E(t)=?t+? round to the nearest tenth
\n" ); document.write( "Use the function to predict the life expectancy in 2005
\n" ); document.write( "E(15)=? round to the nearest tenth \n" ); document.write( "
Algebra.Com's Answer #182518 by ankor@dixie-net.com(22740)\"\" \"About 
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In 1990, the life expectancy of males was 64.7 years, in 1995 it was 67.8 years. Let E represent the life expectancy in year t and let t represent the number of years since 1990.
\n" ); document.write( "E(t)=?t+? round to the nearest tenth
\n" ); document.write( ":
\n" ); document.write( "Find the slope
\n" ); document.write( "In 1990; x1=0 and y1=64.7
\n" ); document.write( "In 1995; x2=5 and y2=67.8
\n" ); document.write( ":
\n" ); document.write( "Find the slope (m) using the slope equation: m = \"%28y2-y1%29%2F%28x2-x1%29\"
\n" ); document.write( "m = \"%2867.8-64.7%29%2F%285+-+0%29%29\" = \"%283.1%29%2F%285%29\" = .62
\n" ); document.write( "therefore:
\n" ); document.write( "The Linear function E(t) that fits the data is.
\n" ); document.write( "E(t)= .62t + 64.7
\n" ); document.write( ":
\n" ); document.write( "Use the Function to predict the life expectancy in 2005.
\n" ); document.write( "This means t=15; substitute 15 for t in the equation
\n" ); document.write( "E(15)= .62(15) + 64.7
\n" ); document.write( "E(15)= 9.3 + 64.7
\n" ); document.write( "E(15)= 74 yrs is the life expectancy in 2005
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