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Concrete is sold by the cubic yard (36 in x 36 in x 36 in or 46,656 cu in). 100 square feet is equal to 10 ft x 10 ft or 120 in x 120 in or 14,400 sq in. To "cube" this measurment, multiply it by 4 in (thickness) or 57,600 cu in. To detemine cubic yards, divide by 46,656 or 1.23 cubic yards.
12 ft x 10 ft x .333 ft (4 in) = 39.96 cu ft. You need enough concrete for 40 cubic ft.
157 pounds
Just find the volume of the sidewalk. First get everything into Feet. Divide 4 by 12 and get 1/3' which is about .3333'. Now just multiply 36*5*.3333=60 ft.³
That is 53x1 x 8/12 = 35.33 cubic feet. That is 1.31 yards and weighs 5300 pounds