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commutative property
Because the order is whitched 
If is had 3(3+3)=18, then that would but distributive property 
If it had 1+(2+3) = (1+2)+3, then that would be associative property
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   Given equation shows the associative property of addition.

  Associative property of addition states,

  • a + (b + c) = (a + b) + c

Given expression in the question is,

5 + 7 + 9 = 7 + 5 + 9

Given expression follow the same rule.

    Therefore, equation follow the associative property of addition.

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