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81
87.75 square inches
42 ft x 30 ft = 1,260 square ft1 yd = 3 ft(1 yd x 1 yd) = 1 square yd = (3 ft x 3 ft) = 9 square ft.1,260 square ft = (1,260 / 9) = 140 square yards
11 feet by 9 feet is 99 square feet. A square yard is 9 square feet, so there are 11 square yards in 99 square feet.
5 ft by 9 ft is 45 square feet. This requires 6,480 square inches to cover it.