Hi, Assuming the - was an = sign

The average life expectancy after age 65 is soaring, putting pressure on the Social Security Administration’s resources. 

According to the Social Security Trustees, the ,average life expectancy after age 65 is given by

L(t) = t + 18.1 (0 ≤ t ≤ 7)

a. How fast is the average life expectancy after age 65 changing at any time during the period under consideration? /yr

b. What will the average life expectancy be after age 65 in 2012?  

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