This is related to the fact that a cube has three dimensions. Basically, the volume of a cube is calculated by raising the length of a side to the third power.
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cubed
six cubed is 63
x + x = 2x. Similarly, x^3 + x^3 = 2(x^3)
I assume the question is about an exponent whose value is a half (or a multiple of a half). An exponent of a half is simply the square root. Similarly, an exponent of (1/3) is a cubed-root and so on.
Cubed is the term for "to the power of three". 273 is called Twenty-seven cubed....so it's just not just the 33 that is called cubed.