1. 15-3
2.x+4=12
3. (6-2)+9
4. 2x+2= 22
5.7×n=56
•••
6.x=8
7. x=40
8. C
9. B
10.B
1. D
2.C
3.C
4.C
5.A
HOPE IT HELPS [tex] \color{blue}{\boxed{{\colorbox{black}{little Einstein}}}}{ \rule{0pt}{0pt}}[/tex]