A disadvantage of secrecy could be reduced communication of information.
Answer:
1. -1/4
2. 3/4
3. 5
4. 9/10
5. -9/10
6. undefined
7. 5/3
8.1/3
9. -7/6
10. 10
11. 10
12. 3/2
13. 3
Apologies if not all of these are right. But you can use a site called desmos graphing calculator as well. definitely helps a lot!
C) The system of cooperation known as feudalism ended around the 15th century.
