The answer: 8 inches.
The math: 1 foot = 12 inches; 12 inches + 4 inches = 16 inches; 16 inches - 8 inches = 8 inches.
Learning about measurement conversion will help you do this yourself.
8 inches are left
(10 feet 8 inches) minus (4 feet 8 inches) = 6 feet
10 feet 8 inches minus 7 feet 8 inches = 3 feet
(8 feet 0 inches) minus (2 feet 5 inches) = 5 feet 7 inches.
4 feet 8 inches
14 ft 3 in - 3ft - 8in -1in = 10ft 6 inches.
8 feet 3 inches - 4 feet 8 inches = 3 feet 7 inches
8 ft 8 inches
The difference between 2 feet and 8 inches and 6 feet and 8 inches is -48 inches.
20 inches or 1 foot and 8 inches
11 inches
5 ft 10 inches
3/8 - 2 5/8 = -2 1/4 inches.