13] Refer to the figure below. Find the value of x.
(A)
58°
(B)
94°
(C)
28°
(D)
84°
(E)
Not Here

Answer:
C x = 28°
Step-by-step explanation:
(x +30)° + (3x +10)° + x° = 180°
x +30 + 3x + 10 + x = 180
5x + 40 = 180
5x = 140
x = 28°