Yes, an empty box is and No, polyhedrons don't have to be.
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A solid box is a cube.
One, after which the box is no longer empty!
A variable is used to hold value. The value may vary in every usage. An empty box is used to hold things. So, it can have in it the things we put in. The things to be held in the empty box,can change upon every usage. So, an empty box is like a variable.
One, after which the box is no longer empty!
box with matches = 45 grams box empty = 12 grams so just matches = box with matches - empty box = 45-12 = 33 grams 33 grams = 220 matches 33/220= each match weighs 0.15 grams