Aset is under an operation (such as addition, etc) if any two elements of that set always generate another element in the set, when the operation is performed on them.

If any two elements of the set always generate another element in the set itself, when an operation is performed on them, then that property is called CLOSURE.

Also, that set is said to be CLOSED under that operation.

Hence, the correct answer to fill the blank is CLOSED.

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.