In a geometric figure two intersecting lines create four angles, where angle 1 and angle 3 are a vertical pair. of m-angle 1 = (3x - 25)° and m-angle 3 = 104, what is the value of x?
Since angle 1 and angle 3 are a vertical pair, they are congruent to each other. Therefore, we can set up the equation:
3x - 25 = 104
Now, solve for x:
3x = 129
x = 43
Therefore, the value of x is 43.