Commutative property of addition:

The order in which numbers are added does not change the sum.

For any numbers a and b,

                    (According to commutative property: )

Associative property of addition:

The way in which numbers are grouped when added does not change the sum.

For any numbers a, b and c;

According to associative property, the statement can be written as

                                                     (Add: )

The simplified expression is k+57.