Respuesta :

let's recall that the sum of all interior angles in a triangle is 180°, so then


[tex]\bf 71^o+45^o+(8x)^o=180^o\implies 116+8x=180\implies 8x=64 \\\\\\ x=\cfrac{64}{8}\implies x=8[/tex]

Answer: X=8


Step-by-step explanation:

Since a triangle is 180 degrees in measure, you would first have to set up an equation. The equation would be 71+45+8x=180.

Then you add the like terms, 71 and 45, which equals 116. Then, your equation would look like this: 116+8x=180. Thus, you subtract 116 from both sides, resulting in 8x=64. After you divide by 8 on both sides x=8.

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