Respuesta :

That is a right angle so it is 90° in total. Add all the bits inside
x + 2x + x + 10 = 90°
4x + 10 = 90
- 10 from both sides
4x = 80
Divide both sides by 4
x = 20

Answer:

20

Step-by-step explanation:

The combination of 3 angles is a right angle

x + 2x + (x + 10) = 90

4x + 10 = 90

4x = 80

x = 20