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harmony7
I think it's 144

multiply 12 by 4 because there are 4 walls then multiply 3 by the product of 12×4 and that should be your awnser
vanhkhuyentt2
Call slant height is s and side length is a. We have the area of 1 face is : 1/2as = 1/2*3*12= 18. Therefore, the area of the walls will be:  8*18= 144 (square foot) and the cost will be $3*144= $432. 

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