Question 637051
You need to subtract feet from feet
and inches from inches.
The feet is easy, but how do you subtract 
11 inches from 3 inches?
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What you do is borrow 12 inches from
the 8 feet, so now it looks like
7' 15"
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Now subtract feet from feet and inches
from inches
7' 15" minus 5' 11" = 2' 4"