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I need help with 6 my question is that what is if her estimate is reasonable and please show work I you have to thanks

I need help with 6 my question is that what is if her estimate is reasonable and please show work I you have to thanks class=

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Her estimate is close so I guess she's reasonable.Here's my work:
Formula for surface area of a rectangular prism is: A=2(wl+hl+hw)
w=6     h=8    l=13.2
A=2(6×13.2+8×13.2+6×8)
A=2(79.2+105.6+48)
A=2(232.8)
A=465.6ft²

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