If the number is represented by variable x, then twice the number is represented by 2x.
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Yes. A variable by itself, or anything that contains a variable, would be a variable expression (unless the variable cancels out, as in "x - x", which always has the same value).
It would be: 6/x whereas x is the unknown variable
Assuming you call your number "n", the expression would be "14n". You can replace "n" with whatever variable you want to use.
The coefficient would be the number multiplied by the variable, in this case: 7
Because it varies, otherwise it would be a constant.