Hi, I'm doing homework and there are a few problems I don't understand at all.
The first is (find a simplified expression without absolute value notation)
 |4x/x| if x < 0
- Would it just be -4x/x since x < 0 makes it negative or would it be something else because ex. if you had 4(-1)/(-1) that's -4/-1 or 4 which is positive..
 |x-1|/1-x| if x < 0
- same as above... not sure what to do. if x was -2 or something (x<0) it would be -2 -1 / 1 - -2 which would be -3 / -1 = 3 which is positive again?
 -2|x| / -2x
- no idea about this and the only thing inside the absolute value bar is the x ?
 |20| - | - 19|
- again I don't understand the negative by itself inside the bars and the several absolute value bars instead of just one
thanks so much in advance for the help!!