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Do your own homework. If you're going to ask for test answers, at least tell us what text 5.1 is from.
No - a centimetre is a unit of length, while cg is an abbreviation for centigram, a unit of mass.
It is Composite!!
5.1 is the cubic footage of the box. And that's the inside space, a 5.1 is the size of a dish pack 18 x 18 x 27in the box business since 1985. Http://boxbros.com