3 cubed is equal to 27.
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-3 cubed is simply (-3)(-3)(-3), so -3 x -3 = 9 and 9 x -3 = -27 ... As a guideline, when a number is cubed the answer will have the same sign (positive or negative) as the number you start with.
4 is the number after 3. 3 cubed = 3x3x3=27 4cubed = 4x4x4 = 64
2.5 x 3 cubed = 2.5 x 27 = 67.5
cubed is when you times the number by itself 3 times e.g. 3times3times3=27=cubed