Which equations support the fact that rational numbers are closed under addition?
select each correct answer.
9√+9√=29√9+9=29
13+13=2313+13=23
6√+(−6√)=06+(−6)=0
2√+2√=22√

Step-by-step explanation:

Since, according to the property that rational numbers are closed under addition.

If a and b are the rational number then (a+b) must be a rational number.

Since, In First option

Addends √ 9 and √ 9 are rational number.

Also, 2 √9 is the rational number.

Thus It is following the property.

In Second option

Addends and are rational numbers.

Also, is a rational number.

Thus, It is also following the property.

Note: Both √6 and √2 are the irrational numbers.

This is why we did not take them.

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step-by-step explanation: