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

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