Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 9x2 - 4y2
A. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
B. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: ellipses 
C. Domain: all points in the first quadrant of the xy-plane; range: all real numbers; level curves: hyperbolas 
D. Domain: all points in the xy-plane; range: all real numbers; level curves: hyperbolas 
Answer: D
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A. 
B. 
C. 
D. 
Solve the problem.Decide whether or not the points are the vertices of a right triangle.(1, 3), (7, 5), (6, 0)
A. No B. Yes
Factor the sum or difference of two cubes.343x3 + 729
A. (7x + 9)(49x2 - 63x + 81) B. (343x - 9)(x2 + 63x + 81) C. (7x - 9)(49x2 + 63x + 81) D. (7x + 9)(49x2 + 63x + 81)
The graph of a quadratic function is given. Determine the function's equation.
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