Solving inequalities unit test. to see questions go to pdf attachment below. you may not be able to access if you are on a phone. i would like answers, but i really need someone to explain it to me.

Alright, I'll explain them as well.
1. The answer is 7, The open end of the sign is always to the larger number. 
2. The answer is 4, and again, the open end of the sign is always to the bigger number.
3. The answers is two, and as before, 2 is the only number that will not make it negative or 0 and make the larger number be to the open end of the sign.
4. I'm not entirely sure on this one, so I won't answer it because I don't want to be the reason you get it incorrect.
5. For this one, divide 180 by 2.25, this will give you 80. The inequality should be 2.25k ≥ 180, k ≥ 80.
I hope this helps, have a nice day :)