1. Not random. Because you are asking people if they like ICE CREAM in a ICE CREAM shop.
2. Not random. Because they are serving a small controlled group.
3. Not random. Because you go shopping at Publix because you like it.
4. Random. Because you don't choose who is home or not.
1/6 because one divide by six equal 0.166666.....
It could be B but I want to say D because it relates more to the question.
1) 6x-7y=-11
2) x=-2
3) y=-4x+1
4) y-5=3(x-1)