i assume you mean that the length of one edge of the cube is 12 feet. if so:
there are 6 faces on a cube
each face is a square
the area of a square is it's side squared
so...
6(12x12) = SA
6(144)=SA
864=SA
864 ft squared is the surface area
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I guest that you mean that every edge of the prism is 10 ft, that is it is a cube of side 10 ft: A cube has 6 faces all the same size ⇒ surface_area = 6 x 10 ft x 10 ft = 600 sq ft.
148
Total surface area = (2*pi*radius squared)+(pi*diameter*height)
448
area = 9 ft x 40 in // 1 ft = 12 in ==>> 40 in = 40:12 = 3.333 333 333 ft area = 9 ft x 3.333 333 333 ft = 30 sq ft