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30 October, 02:54

In 2009 the life expectancy is about 80 life expectancy gains 5.7 years every decade. From 2009 in how many years would humanity achieve a life expectancy of 120 years

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  1. 30 October, 03:17
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    about 70 years

    Step-by-step explanation:

    Life expectancy (e) improves by 5.7 years every 10 years, so 5.7/10 = 0.57 years per year. For t years after 2009, it can be modeled by ...

    e = 0.57t + 80

    We want to find when that is 120:

    120 = 0.57t + 80

    40 = 0.57t

    40/0.57 = t ≈ 70.2

    About 70 years from 2009, humanity may achieve a life expectancy of 120 years.
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