$\"\"$

The expression is, $\"\"$

Additive identity: For any number $\"\"$ , the sum of $\"\"$ and 0 is $\"\"$ i.e. $\"\"$ .

$\"\"$ , since $\"\"$ . This is called the additive identity property. $\"\"$

The value of $\"\"$ is 0.

The property used is the Additive Identity property.