Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = sin-1(x2 + y2)
A. Domain: all points in the xy-plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
B. Domain: all points in the xy-plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
C. Domain: all points in the xy-plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the xy-plane; range: all real numbers; level curves: circles with centers at (0, 0)
Answer: B
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Perform the indicated operation. Write the result in the form a + bi.(9 - 8i) + (3 + 6i)
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A. 
B. 
C. ?
D. 
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