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To find the total surface area of one tent, we can calculate the area of the base, the two sides, and the top separately.
Base area = length x base = 7.5 ft x 8 ft = 60 sq ft
Side area = 2 x height x base = 2 x 6 ft x 8 ft = 96 sq ft
Top area = base x height = 8 ft x 6 ft = 48 sq ft
Total area = base area + side area + top area = 60 sq ft + 96 sq ft + 48 sq ft = 204 sq ft
Since one roll of tent material covers a surface area of 825 square inches (5.73 sq ft), we need to convert the total area to sq ft: 204 sq ft = 23.81 sq ft
Now let's calculate the total material required to make 10 tents: 23.81 sq ft x 10 = 238.1 sq ft
Therefore, we would need 4 rolls of tent material (238.1 sq ft / 57 sq ft per roll = 4.18 rolls) to make 10 tents. Rounded to the nearest whole number, we need 4 rolls of tent material.