Respuesta :

angle46089

Answer:

11.

x = 108°

y = 36

z = 24

12.

x = 5

Step-by-step explanation:

11.

72 + x = 180

-72         -72

x = 108°

72 = 2y

÷2    ÷2

36 = y

3z + 108 = 180

     -108     -108

3z = 72

÷3    ÷3

z = 24

12.

4x + 25 + 5x + 20 = 90

9x + 45 = 90

     -45     -45

9x = 45

÷9    ÷9

x = 5

I hope this helps!