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March 29, 2017

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In 1994 the life expectancy of males in a certain country was 61.6 years. In 1999, it was 63.8 years. Let E?
represent the life expectancy in year t and let t represent the number of years since 1994.


1) The linear function E(t) that fits the data is: E(t)=___t+___

2) Use the function to predict the life expectancy of males in 2007.
E(13)=______

  • Algebra - ,

    Are we assuming that the increase is linear ?
    If so, then
    treat you given data as two ordered pairs
    (0,61.6) and (5,63.8)

    slope = (63.8-61.6)/5
    = .44
    then E(t) = .44t + b , the standard form of a linear equation
    plug in (0,61.6) which is like the y-intercept, so b= 61.6

    E(t) = .44t + 61.6

    test it for t=5 , the year 1999
    E(5) = .44(5) + 61.6 = 63.8
    as expected

    now when year is 2007, t = 13
    E(13) = .44(13) + 61.6 = 67.3

  • Algebra - ,

    Thank you so much, I was having problems with this question.

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