Question 1187067
1. False counter example is 10.
2. Yes, this is true.
3. False. Sometimes this is true. 
4. Same as 3
5. Same as 3 and 4.
6.False. Counterexample is 9.
7.False. If the decimal ends it is, but not in instances where it does not, like pi or e.
8. False if y is not 3.
9. True.
10. True. All one needs is one, and I know one.