There are many things that you can use an empty box for. You could cover it with pretty paper and use it for storage in your home office. Children could color it and you would cut out windows and doors to make a doll house. It could also be turned into a space ship.
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Yes, an empty box is and No, polyhedrons don't have to be.
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