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A variable.

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

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.


An unknown or changeable quantity is called?

Variable


What is a symbol that stands for an unknown quantity is called?

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.


What A unknown or changeable quantity is called a(n) .?

The answer is variable


What is the unknown amount or amounts that are represented as letters in an equation called?

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.