Respuesta :

Answer:

C

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

Sum the 3 given angles and equate to 180

y + y + 54 = 180

2y + 54 = 180 ( subtract 54 from both sides )

2y = 126 ( divide both sides by 2 )

y = 63° → C

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