Answer:
1) x = 4, 2) x = 9, 3) x = 9
Explanation:
Since you give no other context my guy I am assuming this is a similar triangles kind of thing. Comparing the triangles you can create what is known as a scale factor, (Ex: 10/2 = 5) and then multiple/divide by this scale factor to get the unknown number (Ex: 20/5 = 4)
Repeat with all three triangles