8. [tex]$13 - 6 = \, $[/tex]

9. [tex]$\, x + 6 = 10$[/tex]

10. [tex]$\, x + 6 = 13$[/tex]

11. [tex]$\, x + 6 = 12$[/tex]

12. [tex]$\, x + 6 = 16$[/tex]

13. [tex]$\, x - 6 = 9$[/tex]

14. [tex]$\, x - 6 = 4$[/tex]

15. [tex]$\, x - 6 = 0$[/tex]

16. [tex]$\, x - 6 = 8$[/tex]

17. [tex]$6 + x = 11$[/tex]

18. [tex]$6 + x = 14$[/tex]

19. [tex]$6 + x = 10$[/tex]

20. [tex]$6 + x = 15$[/tex]

Let's go through each of these arithmetic problems step-by-step:

1. [tex]$13 - 6$[/tex]
Subtract 6 from 13.
Result: 7

2. [tex]$+6 = 10$[/tex]
To find the missing number, subtract 6 from 10.
Result: 4

3. [tex]$+6 = 13$[/tex]
To find the missing number, subtract 6 from 13.
Result: 7

4. [tex]$+6 = 12$[/tex]
To find the missing number, subtract 6 from 12.
Result: 6

5. [tex]$+6 = 16$[/tex]
To find the missing number, subtract 6 from 16.
Result: 10

6. [tex]$-6 = 9$[/tex]
To find the missing number, add 6 to 9.
Result: 15

7. [tex]$-6 = 4$[/tex]
To find the missing number, add 6 to 4.
Result: 10

8. [tex]$-6 = 0$[/tex]
To find the missing number, add 6 to 0.
Result: 6

9. [tex]$-6 = 8$[/tex]
To find the missing number, add 6 to 8.
Result: 14

10. [tex]$6 + = 11$[/tex]
To find the missing number, subtract 6 from 11.
Result: 5

11. [tex]$6 + = 14$[/tex]
To find the missing number, subtract 6 from 14.
Result: 8

12. [tex]$6 + = 10$[/tex]
To find the missing number, subtract 6 from 10.
Result: 4

13. [tex]$6 + = 15$[/tex]
To find the missing number, subtract 6 from 15.
Result: 9

These are the step-by-step calculations for each question. Let me know if you need further assistance!