Question

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Answer 1

Answer:

12.2 + 18.6 + –4.3 + (–18.6)

12.2 + –4.3 + 18.6 + (–18.6) This shows commutative property.

The commutative property states that order does nor matter. Multiplication and addition have commutative property.

12.2 + –4.3 + [18.6 + (–18.6)] This shows associative property.

The associative property states that we can re-group numbers in any order and get the same answer.

[18.6 + (–18.6)] ; This portion also shows additive inverse as you get 0 in the next step => 12.2 + –4.3 + (0)

The additive inverse of a number is that number, which you add to a number to get the sum of 0.

12.2 + –4.3 + (0) This shows identity property.

Identity property of addition states that when we add zero to any number, it equals the number itself. Like here adding 0 got the same number -4.3 in the next step.

Answer 2

Commutative Property 
associative property
additive inverse  <span />