Simplify the radical expression. Assume that all variables represent nonnegative real numbers.(
- 
)2
A. a2 - 
+ b2
B. a2 - 2
+ b2
C. a - 2
+ 7b
D. a - 
+ b
Answer: C
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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 
Find the area if the distance between two adjacent dots in a row or column is one unit.What is the ratio of the area of rectangle B to the area of rectangle A. 
A. 
B. 
C. 
D. 
Find the angle between the two planes.
?
?
A. 71.5
B. 72.5
C. 73.5
D. 70.5
E. 69.5
Solve the problem.A store sold 32 rugs on Monday, 19 rugs on Tuesday, and 28 rugs on Wednesday. How many rugs did the store sell in all?
A. 79 lamps B. 78 lamps C. 80 lamps D. 89 lamps