It doesn't work like that there are too many variables. When tapers see the job, or know the boarders, they know instantly, but not by square feet.
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Depends entirely on how good your boarding and taping is.
That would be almost impossible to determine because there is no way of knowing the different thicknesses that will actually fill the wall surface.
You will need at least 14 sheets, depending on shape and height of wall.
A 10 X 10 area or 100 square feet.
One square yard is nine square feet, so 27 square feet is equivalent to 3 square yards. So 3 yards of concrete will cover 27 square feet.