What is the length of the diagonal of a cube with a side length of 4 inches? Round to the nearest tenth.

The diagonal through the cube’s interior is found with the formula d = s√3, where s is the side length. With s = 4 inches, d = 4√3 ≈ 6.928 inches, which rounds to 6.9 inches. Therefore, the correct choice is B, 6.9 inches.

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