A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
The answer is variable
Variable.
in algebra any letter really, however normally it's an x
x is a variable that represents an unknown number and its value depends on the algebraic expression it is used in.
In mathematical expressions, a variable (a letter used to represent a certain value) represents an unknown or changeable value. It is often the variable x.
a variable
A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
Variable
The answer is variable
Variable.
in algebra any letter really, however normally it's an x
x is a variable that represents an unknown number and its value depends on the algebraic expression it is used in.
It is unknown and it usually just represented as pi. It represents the ratio between the circumference and the diameter.
x= the unknown
She was a changeable person because she was changed from bad to good. Another suggestion: She was a changed person because she changed from bad to good, not necessarily because she was changeable. Her personality would be described as changeable only if she swung back to a former behaviour, good or bad or whatever value one placed upon it. Changeable means inconstant or inconsistent, like the weather, and implies little self-control.
A variable is usually used for that - for example, a single letter that represents the unknown quantity.