400
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40 x 90 = 3600 square feet. No exponents are necessary.
162/3 sq yards
10,800 square feet.
A square yard is 3 feet by 3 feet, 9 square feet in total. Therefore 2 square yards is equal to 18 square feet.
First of all divide 2" by 12" to get 0.1666 feet; then multiply 0.1666' x 40' x 40' which equals 266.56 cubic feet; Multiply 266.56 cubic feet x 0.03704 to get 9.8734; Therefore, 2 inches of topsoil from an area 40 feet by 40 feet = 9.87 cubic yards. Hope that helps. The number 0.03704 is purely a conversion rate for cubic feet to cubic yards.