math-word problem

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In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life expectancy in yeart and let t represent number of years since 1992.

Fill in the linear function E(t) that fits the data
E(t)=____t+____

uses this to prdict the life expectancy of males in 2009

E(17)=____

To find the slope would it then be 75.7-73.5/73.5
so the slope would be 33.4? or would it just be 2.2?

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