1. Consider that the sum of the angles is equal to 90°, then, you have:
30° + 44° + x = 90° simplify left side
74° + x = 90° subtract 74° both sides
x = 90° - 74°
x = 16°
2. As in the previous excersice:
x + 74° = 90°
x = 90 - 74°
x = 16°
3. The sum of the angles is equal to 180°.
134° + x = 180°
x = 180° - 134°
x = 46°
4. The given angles are congruent because they are vertical, then:
x = 59°