Help!

https://web2.0calc.com/questions/floor-function-question_1

I think (a) is $1 \le x <2$, 

(b) is $3 \le x <4$

and (c) is $5 \le x <6,$ but I'm not sure. 

Also I still need help on (d). 

--------------Thanks! 

I also think this question is too easy and I'm doing something wrong...

Edit: Yes all my thoughts for the answers are all wrong since I didn't see the extra x multiplying the first floor function. I'll try to work on (a), (b) and (c) but will probably still need help. 

Edit Edit: After furthur examination my answers for a-c might actually be right. 

Edit Edit Edit: I got answers for a-c (a was right and b-c were wrong but I got the right answers) I'm working on (d)

Edit Edit Edit Edit: I got the question no help needed