Use whichever properties (associative and/or communities) are necessary to simplify each expression. (2+n)+9 (5+x+3)+2 Use whichever properties (associative and/or communities) are necessary to simplify each expression. (2+n)+9 (5+x+3)+2 (2+n)+9 (5+x+3)+2 Solution (2+n) +9 =9+(2+n).... commutative property =(9+2)+n ......associative property =11+n Answer (5+x+3)+2 =2+(5+x+3) commutative property =(2+5) +(x+3) associative property =7+ (x+3) =(7+3)+x associative property =10+x Answer ***********.