Question

I need help i dont get some of the problems.

Answer 1

3-65° ،

4- 60°

5- 140°

6- JiH

7- GHQ

9 - 100

10- (3x+6) + ( 9x-8) = 142

12 x-2= 142

12 x = 144

x = 12

11- ( 12x+3 ) + ( x-3) = 90

13x = 90

x = 90÷13

x = 6.9