Answer:
c. 11
Step-by-step explanation:
By the property of intersecting secants outside of a circle, we have:
[tex] m\angle R = \frac{1}{2} \times (175\degree - 75\degree) [/tex]
[tex] m\angle R = \frac{1}{2} \times 100\degree [/tex]
[tex] (4x+6)\degree = 50\degree [/tex]
4x + 6 = 50
4x = 50 - 6
4x = 44
[tex] x = \frac{44}{4} [/tex]
x = 11
