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Supplementary angles add to 180 so x + 128.7 = 180 subtract 128.7 from both sides; therefore, the answer is 51.3
I hope this helps!
A cube has equal length, height and depth.
The area of one face is 5inches * 5inches, which would equal 25inches^2.
Multiply this by 6, for the 6 faces on a cube, and we get 150inches^2 of cardboard.
