if you are dealing with a line then it is just ft if you are dealing with the area inside a 2-diminsional object such as a square or circle then it becomes square ft or ft with a little 2 after it. if you are dealing with the area of a 3 diminsional objects such as a cube, sphere, or pyramid it become cubed ft or ft with a little 3 after it.
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2900 feet is a little more than 1/2 mile.
It's 2 x (9 yd 2 ft) + 2 x (5 yd 2 ft) = 2 x (29 ft) + 2 x (17 ft) = 2 x (46 ft) = 92 ft = 30 yd 2 ft
2 2/3 ft = 2 ft + 2/3 ft. 1 ft = 12 inches, so (12 in/ft)*(2 ft + 2/3 ft) = 24 in + 12*(2/3) in = 24 in + 8 in = 32 in.
7 yd 1 ft - 5 yd 2 ft = 22 ft - 17 ft = 5 ft = 1 yd 2 ft.
8 ft - 2 ft 5 in = 5 ft 5 in