The perimeter of a triangle is the sum of the measures of three sides.

So, .

Expression for the perimeter is .

                (Write the expression)

            (Group like terms)

                 (Add: )           (Rewrite as the summation)

                           (Apply additive inverse property: )

                                (Apply additive identity property: )

The simplified expression for the perimeter of the triangle is 10.

The simplified expression for the perimeter of the triangle is 10.