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a cube that is equal to 1 unit....
it is a unit.
a unit of measure equal to half of a pint
It means Centimeter- it's a unit of measure, like on a ruler.
Not possible to answer this since it's not possible to find out what the problem is - not everyone is familiar with "math paper 2". However if you wish to type the maths problem into the question bar, I'm sure someone will help you with it.