Respuesta :

Answer:

[tex]x = 21[/tex]

Step-by-step explanation:

Apply triangle interior theorem,

[tex]71 + 88 + x = 180[/tex]

[tex]159 + x = 180[/tex]

[tex]x = 21[/tex]
C. 88 + 71 = 159. 180 - 159 = 21

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