Which property allows you to write the expression (3+7i)+(8-6i) as (8-6i)+(3+7i) square Which property allows you to write the expression [(3+7i)+(8-6i)]+(1+9i) as (3+7i)+[(8-6i)+(1+9i)] square commutative associative distributive

The property that allows you to write the expression $(3+7i)+(8-6i)$ as $(8-6i)+(3+7i)$ is the commutative property of addition. The commutative property states that the order in which numbers are added does not affect the sum.<br /><br />The property that allows you to write the expression $[(3+7i)+(8-6i)]+(1+9i)$ as $(3+7i)+[(8-6i)+(1+9i)]$ is the associative property of addition. The associative property states that the way in which numbers are grouped when being added does not affect the sum.<br /><br />Therefore, the correct answer is:<br />associative