Respuesta :

thebecks

Answer:

A) 3x + 1

Step-by-step explanation:

? = (12x + 7) - (3x + 3) - (2x + 1) - (4x + 2)

? = 3x + 1\

lisal25

Answer:

The answer is A

Step-by-step explanation:

When looking at the question, the perimeter in total is 12x + 7. so you have to add what you already know:

3x + 3

2x + 1

4x + 2

______

9x + 6

12x + 7 - 9x + 6 = 3x + 1