Question

change the word phrase to an algebraic expression. use x as the variable to represent the number.
a number subtracted from 21

the word phrase can be written as

Explanation:

Identify the variable and operation

Let the number be represented by \(x\).
The phrase "subtracted from" indicates subtraction where the quantity following "from" is the starting amount.

Translate the phrase to an expression

Subtracting \(x\) from \(21\) is written mathematically as:

$$21 - x$$

Answer:

Change the word phrase to an algebraic expression. Use x as the variable to represent the number.

A number subtracted from 21

The word phrase can be written as <blank>\(21 - x\)</blank>