The exact task is what are the values of B (deadband) and H (hysteresis)
The above 3 graphics are on different scales, so in order to make things easiest to understand I put everything on the same grid.
For the first case there is neither deadzone nor hysteresis, there is only an on-off control, whereas in the other graphs, there is respectively a deadband of ~1.7 at the 2nd graph, and a hysteresis/deadband of ~ 0.25/0,5 at the 3rd graph:
There is a range of input values for which no control is made, which is marked as
yellow, whereas either the values marked as
green and as
red are both the negative feedback control which attempt to turn output back to the desired setpoint.
Here, there is a view of how control signal reacts to each range of the input, with actual values, according to the above picture: