You can do this yourself
Treat the floor and ceiling functions like brackets, I mean, do them first.
The floor function, Like L brackets, means round down to the nearest integer (whole number, can be negative, 0 or positive)
\(\lfloor 6.9 \rfloor = 6\)
The ceiling function does the opposite. So the ceiling of 6.9= 7
so, to start you off
\(\lfloor -4-0.5\rfloor = \lfloor -4.5\rfloor = -5\)