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Mariana [72]
3 years ago
9

A cube has a side length of x feet. Which expression represents the surface area of the cube?

Mathematics
2 answers:
alexdok [17]3 years ago
8 0
The answer is D)6x2 square units.

A surface area of a cube is a sum of its sides' areas. A side of the cube is a square, and there are total 6 sides of the cube. Also, an area of the side of the cube is the area of the square, which can be expressed as a², where a is the length of the side. Therefore, the surface area (SA) of the cube is:
SA = 6*a² = 6a²

If side length is x, that means that a = x units.
After replacing it in the formula, you will have:
SA = 6a² = 6x² square units

Kay [80]3 years ago
7 0
I hope this helps you

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