## Thinking Mathematically (6th Edition)

$16$ years
A person who has a blood relative 95 or older will stretch his/her lifespan by 10 years. The number that represents this is $10$. A person who has less than 12 years of education shrinks his/her lifespan by 6 years. The number that represents this is $-6$. Thus, the difference between the lifespan of the two is: $=10 - (-6) = 10+6=16$