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missmychiefrkt0
30.05.2020 •
Mathematics
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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Ответ:
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.
Ответ:
1 pound = 0.453592 kilograms
160 pounds = ? kilograms
160 pounds • 0.453592 = 72.57472
rounded to the hundredths place, the answer would be 72.57
160 • 0.45 = 72 kilograms