In a geometric figure two intersecting lines create four angles, where ∠1 and ∠3 are a vertical pair. If m∠1=(3x−25)° and m∠3=104° , what is the value of x ?(1 point)
Since angle 1 and angle 3 are a vertical pair, they are congruent.
Therefore, 3x-25 = 104.
Adding 25 to both sides, we have 3x = 129.
Finally, dividing both sides by 3, we get x = <<43=43>>43.
So the value of x is 43. Answer: \boxed{43}.