This question cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A foot is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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the answer is 90 sq ft. there are 9 square ft in 1 square yard. 9 * 10 = 90
90 * 330 = 29700 sq ft
90-ft x 7-ft = 630 square feet
If you mean a 9 ft x 10 ft floor, then it is 90 ft2.
90 x 7 = 630 sq ft