Answer
$14+x$
Work Step by Step
Commutative properties: $a+b=b+a,\qquad ab=ba$
Associative properties:$ a+(b+c)=(a+b)+c,\qquad a(bc)=(ab)c$
Distributive property: $\quad A(x+y)=Ax+Ay$
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$ 3+(x+11)=\qquad$
...commutative property: x and 11 can change places
$=3+(11+x)=$
...associative property: we can change groupings,
$=(3+11)+x$
$=14+x$
