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: real numbers z ? 0; 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: all real numbers; level curves: parabolas 
Answer: D
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A. 6, 
B. - 
, - 
C. 
, - 
D. - 
, 
Use a half-angle formula to find the exact value of the expression.sin 105°
A. 
B. - 
C. - 
D. 
Solve the given equation for the indicated variable.V = 
Bh for B
A. B = 
B. B = 
C. B = 
D. B = 