Answer :
ANSWER
[tex]3+(6+10)=(3+6)+10[/tex]EXPLANATION
Associative property of addition means; when you add, you can group the numbers in any combination. For example
[tex](a+b)+c=a+(b+c)[/tex]So the only option that obeys this rule is
[tex]3+(6+10)=(3+6)+10[/tex]