Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ex+y
A. Domain: all points in the xy-plane; range: all real numbers; level curves: lines x + y = c
B. Domain: all points in the xy-plane; range: real numbers z > 0; level curves: lines x + y = c
C. Domain: all points in the first quadrant of the xy-plane; range: all real numbers; level curves: lines x + y = c
D. Domain: all points in the first quadrant of the xy-plane; range: real numbers z > 0; level curves: lines x + y = c
Answer: B
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