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This can't be answered because you have not given the third dimension. You must say how thick the slab is.
6.67 Cubic Yards
For this area you will need 2.4 cubic yards.
7.1
1.78 cu. yds.
2x2
I would get 12 to be safe.
This can't be answered because you have not given the third dimension. You must say how thick the slab is.
4
should be at lest 4 inches
about 25 yds
6.67 Cubic Yards
As a guideline, 4 inches thick, but it would depend on what is going to be sitting on top of it. You may need thicker and/or to reinforce it with rebar.
how much does it cost to form and pour concrete in Mobile, AL
about how much to pour a concrete slaba 12 x 14'
Mix sawdust - preferably fairly big flakes - with water to a thick porridge. Pour into a mold, and freeze it.
You will need a minimum of 74.1 cubic yards.