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The surface are is 136 sq in.

You have to find the area of each of the six sides.

2 sides will have dimensions of 8x3 (48 sq in)

2 sides will have dimensions of 8x4 (64 sq in)

2 sides will have dimensions of 3x4 (24 sq in)

Finally add them all up.

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Q: What is the surface area of a rectangular prism with the dimensions 3 inby4in by 8 in?
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