An unknown number is a number that could not be traced by the phone system. A withheld number is when the caller does not want the recipient to know who it's from.
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It depends what "x" is. ======== An algebraic expression representing the difference (subtraction) between 6 and some unknown number (represented by x).
A great number of people have a problem with this, which causes quite an amount of trouble. Number refers to something that can be counted. Amount refers to an unknown quantity or something that cannot be quantified, like feelings, intentions, impressions, etc.
the number itself
There are four each. The difference is zero.
the difference is called a range.