## University Calculus: Early Transcendentals (3rd Edition)

a. Domain : The domain is the set of all $(x,y)$ in the xy plane. b. Range: $R: 0 \lt z\leq 1$ c. Level Curves: The origin and the circles with center at (0,0) having radii $r \gt 0$ d. No boundary points e. Both closed and open. f. Unbounded