Iknow how to solve number 4 but i’m having a hard time with 1,2,3,5,6

  Part 1)
angle b=112> by vertical angles
angle a+112=180> supplementary angles
angle a==180-112> angle a=68
angle c=angle a> by vertical angles
angle c=68

the answer part 1) is

angle a=68°
angle b=112°
angle c=68°

part 2)
angle a+15+38=180> angle a=180-(15+38)> angle a=127

the answer part 2) is
angle a=127°

part 3)
angle b=40> by vertical angles
angle d=70> by vertical angles
2*angle x+40+angle d=180> 2*angle x=180-(40+70)
2*angle x=70> angle x=35   
angle a=angle x> by vertical angles
angle a=35
angle c=angle x> by vertical angles
angle c=35

the answer part 3) is
angle a=35°
angle b=40°
angle c=35°
angle d=70°

Part 4)
angle a+70=90> are complementary angles
angle a=90-70> angle a=20
angle a+angle b=90> are complementary angles
angle b=90-angle a> 90-20> angle b=70
angle d=70 >  by vertical angles
angle d+angle e=180>  supplementary angles
angle e=180-angle d> angle e=180-70> angle e=110
angle a+angle b+angle c+angle d=180
angle c=180-(20+70+70)> angle c=20

the answer part 4) is
angle a=20°
angle b=70°
angle c=20°
angle d=70°
angle e=110°

Part 5)
angle a+90=180> supplementary angles
angle a=180-90> angle a=90
angle a +angle b=180> supplementary angles
angle b=180-angle a> angle b=180-90> angle b=90
angle e=132> by vertical angles
angle d+132=180> supplementary angles
angle d=180-132> angle d=48
angle c+138=180> supplementary angles
angle c=180-138> angle c=42

the answer part 5) is
angle a=90°
angle b=90°
angle c=42°
angle d=48°
angle e=132°

part 6)
angle a+110=180> supplementary angles
angle a=180-110> angle a=70
angle c=25> by vertical angles
angle b+100+25=180> angle b=180-(100+25)> angle b=55

the answer Part 6) is
angle a=70°
angle b=55°
angle c=25°