15 feet and 7 inches OR 5 yards and 7 inches.
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The sum of 6 ft 10 inches and 8 ft 9 inches is 15.5833333 feet or 15 feet 7 inches.
(6 ft 10 in) + (8 ft 9 in) = (6 + 8) ft + (10 + 9) in = 14 ft 19 in But 19 in = 1 ft 7 in, so (14 ft 19 in) = 15 ft 7 in
6 feet 10 inches and 8 ft and 9 inches = 15 feet 7 inches
14-ft 19-in = 15-ft 7-in
8 ft X 6 ft = 48 sq.ft. ( NOT ft^(2)).