Answer
See below.
Work Step by Step
a. Domain : The domain is the set of all $(x,y)$ satisfying $x^2+y^2 \leq 9$ .
b. Range: $R: 0 \leq z\leq 3$
c. Level Curves: These are the circles with center at (0,0) having radii $r \leq 3$
d. Boundary point is at the circle $x^2+y^2=9$
e. Closed.
f. Bounded