Question

I NEED HELP!!!!!!!!!!!!!!!

Answer 1

refer to the attachment

Answer 2

Answer:

9) x=16;10) x=13 ;11)x=10; 12)x=9

Step-by-step explanation:

9). 5x + 10 +90=180

5x =80

x=16

10). 53 +2x +11=90

2x +64=90

2x =26

x =13

11). 64 +2x +6+90=180

2x +160=180

2x =20

x=10

12). 6x +3+33=90

6x =90-36

6x =54

x =9