Answer:
C. (3x +12) + x = 180°
Explanation:
(3z+12)° is obtuse. x° is acute.
Both are supplementary angles that are linear pair that add up to 180°
(3x + 12)° + x° = 180°
4x + 12 = 180°
4x = 168°
x = 42°
Plug x into (3x + 12)°
3*42° + 12
126 + 12
138°
So the whole thing is 180, we already have 3x+12, it's C.Because A would be 3x +180 (1803x) +something else which would bring it over 180.
C is the answer because 180 is the toal and it isn't going over 180 right away.
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