Solve the system of equations using substitution.
A. x = 2, y = -9; x = 4, y = -5
or (2, -9), (4, -5)
B. x = 2, y = -9; x = 0, y = -5
or (2, -9), (0, -5)
C. x = -2, y = 7; x = 0, y = -5
or (-2, 7), (0, -5)
D. x = -2, y = 7; x = -4, y = 27
or (-2, 7), (-4, 27)
Answer: A
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Find the vertex, focus, and directrix of the parabola with the given equation.(x + 4)2 = -4(y + 1)
A. vertex: (-4, -1) focus: (-4, -2) directrix: y = 0 B. vertex: (-1, -4) focus: (-1, -5) directrix: y = -3 C. vertex: (-4, -1) focus: (-4, 0) directrix: x = -2 D. vertex: (4, 1) focus: (4, 0) directrix: y = 2
Without actually solving the equation, list all possible numbers that would have to be rejected if they appeared as potential solutions. 
+ 
= 0
A. -6, 9 B. 6, -9 C. -6, 9, 9, 7 D. 6, -9, -9, -7
An alpinism club would like to survey its members to determine where to go next summer. ? Decide on a reasonable means for conducting the survey to obtain the desired information. ?
A. Survey as many alpinism club members as possible about where they want to go in summer. B. Survey 1000 random people of different age, sex, nationality, and so on. C. Survey 1000 random people in the street. D. Survey 1000 persons whose names are chosen from the local telephone directory. E. All of these are good surveys.
Express the number in terms of i.-
A. 
i
B. -
i
C. 
D. -22i