Question

alguem qe saiba o passo a passo?

Answer 1

a) 5x+12° + 2x+15° = 90°
5x + 2x + 12° + 15° = 90°
7x + 27° = 90°
7× = 90° - 27°
7x = 63°
x = 63°/7
x = 9°

x+20° + 4x+10° = 90°
x + 4x + 20° + 10° = 90°
5x + 30° = 90°
5x = 90° - 30°
5x = 30°
x = 30°/5
x = 6°