yes
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No. A value that is unknown may not be a variable but simply a constant whose value needs to be calculated.
The variable "I" in algebra can represent any unknown quantity or value. It is commonly used to represent interest in mathematical equations related to finance or economics. However, "I" can refer to any unknown in an equation and its meaning depends on the specific context in which it is used.
a variable (an unknown number/ any number).
No, it is called a constant. For example, in algebra, all number values are constants.
If the value of a function cannot be determined for any value of the independent variable, then, the value the function seems to be approaching would be its limiting value for that particular value of the independent variable.