Solve. Graph the solution on a number line, and express it in interval notation.
(2x - 1) < -6
A. x < - 4, (-?, - 4)
B. x < 4, (-?, 4)
C. x ? - 4, (-?, - 4]
D. x ? 4, [4, ?)
Answer: A
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Sketch the level curve z = k for the indicated values of k.z = x2 + y2, k = 0, 2, 4, 6, 8
A. 
B. 
C. 
D. 
Find the expected value of the random variable.The random variable X is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is given in the table.
A. 3.35 B. 3.60 C. 3.50 D. 3.40
Find the vertices and the foci of the given ellipse.16x2 + 4y2 = 64
A. V: (-4, 0), (4, 0);
F: (- 2
, 0), (2
, 0)
B. V: (0, -4), (0, 4);
F: (0, - 2
), (0, 2
)
C. V: (0, -16), (0, 16);
F: (0, -4), (0, 4)
D. V: (0, 16), (4, 0)
F: (0, 4), (2, 0)
Find the domain of the composite function f ? g.f(x) = x + 2; g(x) = 
A. {x 
B. {x 
C. {x 
D. {x 