Answer
Refer below.
Work Step by Step
a. Domain : The set of all $(x,y)\ne (0,y)$
b. Range: Real numbers
c. Level Curves: The level curves are the x-axis minus origin when $f(x,y)= 0$ and the parabolas $y=cx^2$ minus origin for $f(x,y)=c \ne 0$
d. Boundary point is the line $x=0$
e. Open only
f. Unbounded
