HELP WILL GIVE BRainlist 20 points

THAT IS 10 POINTS NOT 20 LIAR

Step-by-step explanation:

11. x = 5

12. x = 24

Step-by-step explanation:

11.

8x° + 140° = 180°

(Linear pair angles)

8x° = 180° - 140°

8x° = 40°

x ° = 40°/8

x° = 5°

x = 5

12.

2x° + 42° = 90°

(complementary angles)

2x° = 90° - 42°

2x° = 48°

x ° = 48°/2

x° = 24°

x = 24

multiplication is multiplication.   it might feel harder depending on what level of math you are in, but generally it will be the same old stuff, while implementing some new concepts and methods of solving work.