Respuesta :
Answer: D. (5x+40) + (10x) + (7x+8) = 180
Step-by-step explanation: All of the angles of a triangle should add up to 180 degrees, not 90 degrees. Therefore, you can eliminate options A and B. The difference between C and D is the symbol between each angle, which are multiplication and addition. You are supposed to be adding each angle to get a total of 180 degrees, so the answer would be D since there are addition symbols between each angle.