we use "X" as the ---for an unknown quantity.

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we use "X" as the ---for an unknown quantity.
A sign B symbol C mark 其他错在哪区别是什么

In general,all three A,B,C can be used,but B 'symbol' is much more common.
The symbol "X" can also be called 'a mark' or 'a sign';
The following are all possible usages:
1.We use the symbol "X" to represent an unknown quantity.(more common)
2.We use the mark "X" to represent an unknown quantity.
3.We use the sign "X" to represent an unknown quantity.
4.We mark an "X" to represent an unknown quantity.
5.We sign an "X" to represent an unknown quantity.
6.We mark an "X" for an unknown quantity.
7.We sign an "X" for an unknown quantity.
以上7种方式都是可以接受的美语,1 是最长使用的.
Hope this helps.
Cheers
Note:本人已在海外生活了数十载.为了慎重起见,我的答案都与老美或老英交换过意见,你放心使用吧.如有任何问题,可补而述之.

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