Respuesta :

samkr14

Answer:

12x+4

Step-by-step explanation:

For the perimeter, we have to add up all sides of the triangle.

(3x-4) + (4x+5) + (5x+3)

3x-4+4x+5+5x+3

(3x+4x+5x) + (-4+5+3)

12x+4