#### Answer

distributive property, Commutative Property of Addition, Associative Property of Addition, Commutative Property of Addition

#### Work Step by Step

7+2(x+9)
=7+ (2.x + 18) (distributive property)
=7+(18 + 2x) (Commutative Property of Addition )
= (7 + 18) + 2x (Associative Property of Addition )
= 25 + 2x
= 2x +25 (Commutative Property of Addition )