If the sets A and B are nonempty and disjoint, what does 
equal?
?
A. 
B. 
C. A
D. B
E. 
Answer: A
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Find the vertex, focus, and directrix of the parabola with the given equation.(x - 4)2 = -8(y - 3)
A. vertex: (-4, -3) focus: (-4, -5) directrix: y = -1 B. vertex: (4, 3) focus: (4, 1) directrix: y = 5 C. vertex: (4, 3) focus: (4, 5) directrix: x = 1 D. vertex: (3, 4) focus: (3, 2) directrix: y = 6
Solve the problem.A rectangular parking lot must have a perimeter of 104 feet. Write a completely factored polynomial whose values give the area of the parking lot if one side is x feet long.
A. 24(x - 1) B. x(28 - x) C. x(52 - x) D. 28(x - 24)
Represent the shaded area in the figure group with a mixed number.
A. 2
B. 2
C. 2
D. 9
A helicopter makes a forced landing at sea. The last radio signal received at station C gives the bearing of the helicopter from C as at an N 56.9 ° E altitude of 427 feet. An observer at C sights the helicopter and gives 
as 12.8°. How far will a rescue boat at A have to travel to reach any survivors at B (see the figure)? Round your answer to the nearest ten feet.
?
?
?
?
A. 1,620 ft
B. 1,570 ft
C. 1,590 ft
D. 1,580 ft
E. 1,540 ft