Question

A______ is a symbol to represent a number​

Answer 1

Answer:

A basic distinction between algebra and arithmetic is the use of symbols. In algebra, symbols (usually letters) are used to represent numbers. To solve math problems, you should know what variables and constants are. Here is an introduction to the terms variables and constants.

algebra, symbols (usually letters) are used to represent numbers. To solve math problems, you should know what variables and constants are. Here is an introduction to the terms variables and constants. A variable is a letter or symbol used as a placeholder for an unknown value.

Answer 2

A variable is a symbol to represent a number​.

Step-by-step explanation:

• In algebra, symbols (Variables and Constants) are used to denote numbers.  

• A Variable is a character used to denote or represent certain unknown numbers and values.
• The letters $x,y,z,a,b,c$ and $n$ are mostly used in variables.  
• The letters $e$ and $i$ have some important values in algebra and are not considered as variables.
• A letter $o$ is not commonly used in variables because it is misused for $0$  (zero).  

Algebraic expressions:      

• The variables that can help us to change verbal expressions into algebraic expressions that means the algebraic expressions that are composed of letters that signify numbers.  

The following keywords help us to change verbal expressions into numbers and letters.

• The keywords are greater than, more than, sum, increase used in addition.

• Similarly, the keywords are less than, minus, smaller than, decrease, minus are used in subtraction.  

• And for multiplication and division the keywords product, multiplied by, of, times, multiplied by and divided by, halve, ratio are used.

For example,

1) $x$ divided by $y.$    

⇒ $x/y$ or $\frac{x}{y}$.                          

2) Four more than the product of $2$ and $4$ .

⇒   $2x+4$    

Constants:

• Constants are considered as algebraic expressions which only involve numbers.

• They have termed constants because their value is often identical. No variable can change the worth of a continuing.

For example,

⇒  $5xy-2=3y$  

Here the second term of the left-hand side is considered as a constant term and $5xy$ cannot be considered as a constant term because the $x$ and $y$ values can be varied which will affect the entire term $5xy$.