1: A triangle's angles add up to 180
180 - 130 = 50
50 / 2 = 25
x = 25
2: The sides given will be equal as this is a right-triangle
24 = 3(x + 2)
24 = 3x + 6
18 = 3x
x = 6
3: There is a lot of writing so I am unable to see the original triangle
(sorry *nervous sweat*)
4: A triangle's angles add up to 180, and the two sides given will be equal
5y = 20
y = 4
The angles in the bottom-most triangle are all equal to 60 as 180 / 3 = 60.
90 - 60 = 30.
x = 30
Have a nice day!
If this is not what you are looking for - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather