Answer:
x = 29
Step-by-step explanation:
Sum of interior angles of a triangle = 180°
⇒ 59 + 3x + x + 5 = 180
⇒ 4x + 64 = 180
⇒ 4x = 116
⇒ x = 29
C) 29
All triangles add up to 180 degrees,
subtract the known 59 from 180 to get 121.
then combine (3x) and (x + 5) to get 4x + 5
4x + 5 = 121 solve
4x = 116
