A rectangular prism has dimensions x units, 2x units, and x + 8 units.Which expression represents the surface area of the prism?

The surface area of a rectangular prism is 2(lw + lh + wh). For dimensions x, 2x, and x + 8, the three face-area products are 2x², x² + 8x, and 2x² + 16x; doubling their sum gives 10x² + 48x square units. This matches choice C.

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