Math 116

in 1991 the life expectancy of males in certain county was 68.6 years in 1996 it was 70.9 years let t represent the life expectancy in year t and let t represent the number of years since 1991

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asked by Jessie
  1. I know that model
    life expectance= slope*time + constant is the math model here.

    first thing, slope:

    slope= changelifeexpatance/changetime
    = (70.9-68.6)/(1996-1991)=2.3/5

    life expectance= 2.3/5 * year + constant
    now to find the constant:

    life expectancey= 2.3/5 *t + constant where t= (year-1991)
    70.9=2.3/5* 5 + constant
    solving for constant,
    70.9=2.3 + constant
    constant= 70.9-2.3=68.6

    amazing, so now you have
    lifeexpectancey=2.3/5 * t+68.6 where t is the years since 1991

  2. thank u

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    posted by Jessie

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