Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 2x2 - 2y2
A. Domain: all points in the xy-plane; range: all real numbers; level curves: hyperbolas 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
C. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: ellipses 
D. Domain: all points in the first quadrant of the xy-plane; range: all real numbers; level curves: hyperbolas 
Answer: A
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A. 
B. 
C. 
D. 
Solve the problem.The hypotenuse of an isosceles right triangle is 10 feet longer than either of its legs. Find the exact length of each side.
A. (10 + 
) ft, (10 + 
) ft, (20 + 
) ft
B. 10
ft, 10
ft, (10 + 10
) ft
C. 10 ft, 10 ft, 20 ft
D. (10 + 10
) ft, (10 + 10
) ft, (20 + 10
) ft