Respuesta :

Answer:

x + 278 = 450; x = 172

Step-by-step explanation:

Answer:

B-172

Step-by-step explanation:

All I did was add the 2 given sides then subtract that from the perimeter. Then, I got 172 and you don't even have to worry about the equation in the answer choices because it's just there to throw you off once you have the answer your good.

HOPE THIS HELPS!