Answer
See below.
Work Step by Step
a. Domain : The domain is the set of all $(x,y)\ne 0$ .
b. Range: The set of all real numbers.
c. Level Curves: These are the circles with center at the origin (0,0) having radii $r \gt 0$
d. Boundary point is at the origin (0,0); a single point
e. Open.
f. Unbounded