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If the perimeter, p of a rectangle with ...

If the perimeter, p of a rectangle with length l and width w is given by the equation `p=2l+2w`, then

A

`p` and `l` are constants, while `2` and` w` are variables

B

`2` and `w` are constants, while `p` and` l` are variables

C

`p`, `w` and `l` are constants, while `2` is a variable

D

`2` is a constant, while `p`,` l`, and `w` are variables

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