Respuesta :

1st
90+55+x=180 (Angles inside a triangle equal 180 degrees) Solve for x
x = 35 degrees

2nd
2 non-adjacent angle in a triangle is equal to the exterior angles, therefore

25 + x + 15 = 3x + 10    Solve for x
  40 + x = 3x + 10
-10   -1x  -1x  -10

30 = 2x
     2

x = 15 degrees
Therefore angle ABC is x + 15 where x + 15

Therefore angle ABC = 30 degrees

Who ever hand wrote in those degrees/equations didn't really think it out because < A + <B should be greater than 90 not less than 90 

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