Match the surface show below to the graph of its level curves.
A. 
B. 
C. 
D. 
Answer: C
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Provide an appropriate response.At the two points where the curve x2 - xy + y2 = 9 crosses the x-axis, the tangents to the curve are parallel. What is the common slope of these tangents?
A. 2 B. 1 C. -2 D. -1
Solve the problem.An average newspaper contains at least 16 pages and at most 87 pages. How many newspapers must be collected to be certain that at least two newspapers have the same number of pages?
A. 72 newspapers B. 70 newspapers C. 73 newspapers D. 71 newspapers
Factor the perfect square trinomial completely.(m - 4n)2 - 6(m - 4n) + 9
A. (m - 4n + 3)(m + 4n - 3) B. (m - 4n - 3)2 C. (m + 4n + 3)2 D. (m - 4n)2
Find the domain.f(x) = 
A. {x|x ? 13} or [13, ?) B. {x|x ? 13} or (-?, 13] C. All real numbers or (-?, ?) D. {x|x ? -13} or (-?, -13]