Answer:
53
Explanation:
angle 2 and 3, angle 3 and 4 are both supplementary angle, which means a2+a3=180 degree, a3+a4=180 degree.
Since you know that the angle 2 and 4 are both 29 degree,
you can write
a3+29=180, and a3 is represented as 3x-8
so
(3x-8)+29=180 (<-- answer for b)
3x+21=180
3x+21-21=180-21
3x=159
x=53