The answer is A. Angles of a triangle will always add up to 180. If you add up 70+67+57 you are left with 194, which is 14 more than 180. Because we need to be at 180, we can assume that x is a negative number. If we say x is negative 7 we are able to takeaway 7 from 67 and 57. After this, we see that the sum of our angles is 50+60+70=180. Therefore, x=-7 in this situation and angle A is equal to 60. The answer is A.
