If the object is made of liquid, then you measure its mass and volume, because mass divided by volume is density.
If the object is solid with a regular shape, then measure its length, width and height, because length times width times height is the volume of a solid regular object.
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Under the Missouri Compromise on 1820 Missouri got in to the Union as slave state to compromise the balance between slave and non-slave states yet on August 10,1821 the Union restricted the importation of slaves in to Missouri when it became the 24th state.
Answers:
With checks and balances, each of the 3 branches of government can limit and check on the powers of the others.