Answer:
[tex]\Huge \boxed{\mathrm{C. \ 129 }}[/tex]
Step-by-step explanation:
Apply : Angles of Intersecting Chords Theorem
m∠x is half the sum of the measure of the arcs intercepted by the angle and its vertical angle.
m∠x = 1/2(54+204)
Add numbers in brackets.
m∠x = 1/2(258)
Expand brackets.
m∠x = 129
