Question 1130881
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Use the formula for the volume of a frustum of a square pyramid 


V = {{{(1/3)*h*(a^2+ab+b^2)}}} 


where a and b are the base and top side lengths of the truncated pyramid, and h is the height. 


In your case  a= {{{sqrt(9)}}} = 3 inches;  b= {{{sqrt(4)}}} = 2 inches  and  h = 11 ft = 11*12 = 132 inches.


Do the rest on your own.
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