Concrete is a mixture of sand, gravel, cement, and water. Generally, you have 1 part cement, 2 parts sand, and 3 parts gravel. Sand makes up about 1/4 or 1/3 of a cubic foot. At 100 pounds per cu ft that is about 25-35 pounds.
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96 cubic feet of concrete
volume of trench = 10' x 3' x 54' = 1620 cubic feet therefore 1620 cubic feet of concrete will be required.
Volume of concrete needed = 4 x 12 x 1/3 = 4 x 4 = 16 cubic feet
3 cubic feet of it.
That depends on how thick you want it. Multiply 18ft * 18ft * thickness (in units of feet). That will give you your volume in cubic feet. To convert it to cubic yards divide your answer by 27.