Answer:139
Step-by-step explanation:
Answer:
-5
-5x=25
x=25/-5
x=-5
U need to upload a picture
x = 11
∠BCE + ∠ECF = 180°
∴(10x + 15)° + 5x° = 180°
(15x + 15)° = 180°
15x = 180° - 15°
15x = 165°
x = 165°/15°
x = 11°
