1: If column 1 is 6, 2 is 10, 1 is 9, 2 is 15. Column 1 is multiples of 3 and column 2 is multiples of 5.
2. can't read it sorry
3a. 23
3b. 14
4. 10 units squared
5. 1/16
6. 25%
7a. 3x+6
7b. 6c-12
8. 44
9. 4y+8
10. 42
11. 26-15-6+2^3
26-15-6+8
11-6+8
5+8
13