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Collin states that 8+(16+9)=(8+16)+9 is always true . Which of the following properties would prove Collin is correct? 1# transitive property 2# associative property of multiplication 3# associative property of addition 4# commutative property of addition

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It is associative because the multiplication properties are eliminated because you are not multiplying so the ones remaining are
Associative states: you can change the grouping of addends.
Commutative: you can change the order of the addend
Transitive property: if a=b and b=c then a=c

The correct answer is Associative property
User Somacore
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3. associative property of addition.
User Vlad Alivanov
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