Respuesta :

Answer:

1) 2x+19+22x-9=180

12x+22x=180-19+9

34x/34=170/34

x=5

______________

2) 10x-20 and 7x+4

10x-20=7x+4

10x-7x=20+4

3x=24

x=8

so each marked angle:

=7(8)+4

=60°

_______________

3)-4x+5-13x+39=180

-17x+44=180

-174=180-44

x=136/17

x=-8

-4x-8+5

=32+5=137°

-13x-8+39

=104+39

=143

hope it helps...

have a great day!!