Answer:

1. 4+0+9

2. 4+0+9=9+0+4

3. (4+0)+9=4+(0+9)

correct me if I'm wrong

Answer:

1. Identity property of additon.

4+0 = 4

9+0 = 9

2.Commutative Property of addition

4+9 = 9+4 = 13

3. Associative property

(4+0)+9 = 4+(0+9) = 13

Step-by-step explanation:

Identity property of addition, when you add a number and zero the sum is the same number.

Commutative property , we can add numbers in any order, and even we change the order of the addends the sum will stay the same.

Associative property , we can group numbers in different ways, no matter how you group the addends the sum will stay the same.