Respuesta :
Answer: Last option.
Step-by-step explanation:
See the figure attached.
Given two parallel lines, you need to remember that, by definition, when two parallel lines are cut by a transversal, the interior angles formed on opposite side of the transversal are called "Alternate interior angles".
Alternate interior angles are congruent.
You can observe in the figure attached that the angle [tex]115\°[/tex] and the angle [tex](3 x + 4)\°[/tex] are Alternate interior angles. Then, you can say that:
[tex]3 x + 4=115[/tex]
Finally, you must solve for "x". Then:
[tex]3 x + 4=115\\\\3x=115-4\\\\3x=111\\\\x=\frac{111}{3}\\\\x=37[/tex]
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