tolong di jawab ya !

a) 62°+2a=90°
2a=28°
a=14°
b) 8a+4a=90°
12a=90°
a=7,5°
c) (5x+20)+2x+90°=180°
7x+110=180°
7x=70°
x=10°
d) 10a+2a+3a=180°
15a=180°
a=12°
e) (x+22)+(4x+48)=180°
5x+70=180°
5x=110°
x=22
f) 104+5x+36=180°
140+5x=180°
5x=40
x=8°