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

Updated: 4/28/2022

Wiki User

14y ago

A variable.

Wiki User

14y ago

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Q: What is an unknown quantity usually represented by a letter called?
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### What is it called an unknown number represented by a letter or symbol?

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

Variable

Variable

### What is measerment?

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

### What you mean by measurement?

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

variables

### Why are variables used in expressions?

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

### What is nominal quantity?

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.

### Why is x taken as the unknown quantity?

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.

### What will be the unit when a physical quantity is represented in logarithmic form?

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

### What is another name for people they represent?

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