x= the unknown
A variable is usually used for that - for example, a single letter that represents the unknown quantity.
It is a variable and is expressed as a letter as for example it could be x or y
An algebraic expression uses a letter to represent an unknown quantity.
Usually x or n, but can be any letter.
veribal
A variable.
Because, x is a variable, so it can mean any number ever known. It is called the "Unknown Quantity" simply because it represents the number that is not known in the equation. For exampe x+1=y So x and y are variables, each represents a number, if y=2 then it wold be x+1=2 and then you can figure out the "Unknown Quantity" which is 1.
A variable.
Usually x or n, but can be any letter.
The quantity designated by the letter "c" is the speed of light
Unknonwn quantity is any variable a,b,c or x,y
A pronumeral (Why is this in the gaming hardware category?)