Draw graphs of each of these functions.
- $f(x) =$ $\left \lfloor x+1/2 \right \rfloor$
- $f(x) =$ $\left \lfloor 2x+1 \right \rfloor$
- $f(x) =$ $\left \lceil x/3 \right \rceil$
- $f(x) =$ $\left \lceil 1/x \right \rceil$
- $f(x) =$ $\left \lceil x-2 \right \rceil + \left \lfloor x+2 \right \rfloor$
- $f(x) =$ $\left \lfloor 2x \right \rfloor \left \lceil x/2 \right \rceil$
- $f(x) =$ $\left \lceil \left \lfloor x-12 \right \rfloor + 1/2\right \rceil$