document.write( "Question 229521: in 1992 the life expectancy of males in a certain country was 72.1 years. In 1997 it was 74.4 years. Let E represent the life expectancy in year t and let t represent the number of years since 1992. \n" ); document.write( "

Algebra.Com's Answer #170208 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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In 1992 the life expectancy of males in a certain country was 72.1 years.
\n" ); document.write( " In 1997 it was 74.4 years.
\n" ); document.write( "Let E represent the life expectancy in year t and let t represent the number of years since 1992.
\n" ); document.write( ":
\n" ); document.write( "Find the slope
\n" ); document.write( "In 1992; x1=0 and y1=72.1
\n" ); document.write( "In 1997; x2=5 and y2=74.4
\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 = $\"%2874.4-72.1%29%2F%285+-+0%29%29\"$ = $\"%282.3%29%2F%285%29\"$ = .46
\n" ); document.write( "therefore:
\n" ); document.write( "The Linear function E(t) that fits the data is.
\n" ); document.write( "E(t)= .46t + 72.1
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