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September 20, 2014

September 20, 2014

Posted by **i love polka** on Thursday, November 6, 2008 at 10:52pm.

If this trend continues, for which birth year will the average life expectancy be 85 years?

how do u write and equation for to solve this?

- Math -
**drwls**, Friday, November 7, 2008 at 6:07amLet life expenctancy = L . Let y be the number of years after 1900.

L = 55 + 0.2 y = 85

Solve that equation for y

0.2 y = 30

y = 150

That would make the birth year 2050 for a life expectancy of 85.

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