Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
B. Domain: all points in the xy-plane excluding x = 0; range: all real numbers; level curves: parabolas 
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
D. Domain: all points in the xy-plane excluding x = 0; range: real numbers z ? 0; level curves: parabolas 
Answer: B
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Use a calculator to evaluate the expression, or state that the value does not exist. Round the answer to four decimal places when necessary.coth 3
A. 0.0993 B. 1.005 C. 0.9951 D. 10.0677
Find a parametrization for the curve.The upper half of the parabola x - 9 = y2
What will be an ideal response?
Sketch the graph of the equation. If the graph is a parabola, find its vertex. If the graph is a circle, find its center and radius.y2 + x2 - 4x = 0
A. center (-2, -0); radius = 2
B. center (0, 2); radius = 2
C. center (2, 0); radius = 2
D. center (-0, -2); radius = 2
Find all specified roots.Cube roots of 1.
A. 1, - 
+ 
i, - 
- 
i
B. -1, 1
C. 1, 
+ 
i, - 
+ 
i
D. 1, 
- 
i, - 
- 
i