tolong ya kk pakai cara makasih

1.
(2x + 5°) + (3x + 10°) = 180°
5x + 15° = 180°
5x = 180° - 15° = 165°
X = 165°/5° = 31°

2.
OAD = 30x
OAB = 90° - 30x

Sudut A = 90° (karena siki-siku)