What is the surface area of this design?
640 in2
8 in.
384 in2
400 in
256 in2
8 in.
8 in.

Step-by-step explanation:

The missing figure is attached.

You can notice that the design is a cube.

A cube has 6 faces which are all squares.

The area of a square can be calculated with this formula:

Where "s" is the length of any side of the square.

In this case, you can observe in the figure that:

Therefore, substituing that value into the formula, you get that the area of any of the cube's faces is:

Finally, in order to find the surface area of the cube, you need to multiply the area of a face calculated above, by 6.

Therefore, the surface area of the design is:

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step-by-step explanation: