Q: What is an unknown quantity usually represented by a letter called?

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Variable

Variable

An unknown or changeable quantity is a variable. We use variables when we don't know what a certain amount is, and they're usually referred to as "x," or "y."For example, if I had a problem where I needed apples, had $15, and knew that each apple was $1.50, I would use a variable to see how many apples I could buy (because right now that's an unknown number). I could solve it by writing 1.50x =15 to find my answer (which is x =10).

Relationship can also be represented by a set of ordered pairs called a function.

In an equation b or any other letters usually denotes the unknown variable.

Related questions

An unknown number represented by a letter or symbol is a variable.

Variable

Variable

the comparison of unknown quantity against fixed with known quantity is called measurement.

the comparison of unknown quantity against fixed with known quantity is called measurement.

The answer is variable

variables

They take the place of an unknown quantity. They can change values, thus they are called variables, their quantity varies.

A nominal quantity is one that is represented in current dollars, that is, without inflation effect. A quantity that accounts for inflation effects is called a "real" quantity. For more information, please see the related link below.

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.

The logarithm of 'L inches' has no unit of its own. It's called " log( Linches ) ".

People who are represented by someone else are usually called constituents.