Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (6x + 2y)
A. Domain: all points in the x-y plane; range: all real numbers; level curves: lines 
B. Domain: all points in the x-y plane satisfying 6x + 2y > 0; range: real numbers z ? 0; level curves: lines 
C. Domain: all points in the x-y plane satisfying 6x + 2y > 0; range: all real numbers; level curves: lines 
D. Domain: all points in the x-y plane satisfying 6x + 2y ? 0; range: all real numbers; level curves: lines 
Answer: C
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