1. 22
2. -3
3. 21
4. 3.6
5. 22
6. 6
7. 18
8. 6
9. 24
10. 1
Answer: 13
Step-by-step explanation: If you add 13 to itself 60 times, you will get 780.
The answer is 291.60 because you multiply 12 x 9 which equals 108 then multiply 108 x 2.70 which equals 291.60