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

a. Domain: The domain is the set of all points $(x,y)$ inside the circle $x^2+y^2 =9$ . b. Range: $R: z \lt \ln 9$ c. Level Curves: These are the circles with center at (0,0) having radii $r \lt 9$ d. Boundary is the circle $x^2+y^2=9$ e. Open f. Bounded