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 except y = 0; range: real numbers z ? 0 ; level curves: parabolas 
B. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
C. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
D. Domain: all points in the xy-plane except y = 0; range: all real numbers; level curves: parabolas 
Answer: D
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Which of the following physical situations would best be modeled by the graph?
A. The monthly average ocean temperature y in degrees Fahrenheit during month t, where t = 1 corresponds to January.
B. The length y of a shadow cast by a horizontal flagpole on a vertical wall between sunrise and noon, where t is the angle shown.
C. The number of hours y of sunlight during month t, where t = 1 corresponds to January.
D. The length y of a shadow cast by a tree between sunrise and noon, where t is the angle of elevation of the sun.
Graph the rational function.f(x) = 
+ 1 
A. 
B. 
C. 
D. 
Simplify the expression using multiplication.-4(2x - 8y - 6z - 7)
A. -8x + 32y + 24z + 28 B. -8x - 32y + 24z - 28 C. -2x - 12y - 10z - 11 D. 8x + 32y - 24z + 28
Evaluate as requested.Evaluate the polynomial 2x2y - xz3 for x = -3, y= 1, and z = 3.
A. 18 B. -63 C. 117 D. 99