Recall the formula: 1 foot = 12 inches

34 ft. 4 in. = 33 ft. 16 in.

33 ft. – 23 ft. + 3 ft. = 13 ft.

16 in. – 8 in. + 3 in. = 11 in.

34 ft. 4 in. - 23 ft. 8 in. + 3 ft. 3 in. = 13 ft. 11 in.