Simplify. Assume that the variable represents a nonnegative number.
A. 
B. x + 2
C. -x - 2
D. 
Answer: B
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (3x + 3y)
A. Domain: all points in the xy-plane satisfying 3x + 3y > 0; range: all real numbers; level curves: lines 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
C. Domain: all points in the xy-plane satisfying 3x + 3y > 0; range: real numbers z ? 0; level curves: lines 
D. Domain: all points in the xy-plane satisfying 3x + 3y ? 0; range: all real numbers; level curves: lines 
Find the limit, if it exists.
?
?
A. 5 B. 3 C. 4 D. The limit does not exist
Solve the system of equations using substitution.
A. x = -2, y = 3; x = -3, y = 2 B. x = 2, y = 3; x = 3, y = 2 C. x = -2, y = -3; x = -3, y = -2 D. x = 2, y = -3; x = 3, y = -2
Solve the equation by completing the square.x2 + 16x + 43 = 0
A. -16 + 
B. 8 + 
C. -8 + 
, -8 - 
D. 8 + 
, -8 - 