Question

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Answer 1

Its either A or B.  I think its A

Answer 2

I am not sure what 8 means, but I can help you with 9.  

The formula for the area of a circle in pi r^2, but we do not know what the radius is.  We do, however, know that the diameter is 40.  The radius is half the diameter, so we can divide 40 by 2 to get the radius.  This is equal to 20.  Now we plug that into the formula.

pi 20^2 = 400 pi square feet.  So the answer is C.