Solve the problem.Find the second derivative of the function y = x8ln x.
A. 56x7ln x + 15x6
B. 8x6ln x + 15x6
C. 56x6ln x + 15x6
D. 56x6ln x + 7x6
Answer: C
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The question(s) that follow refer to the problem of finding the minimum spanning tree for the weighted network shown below.
Using Kruskal's algorithm, which edge should we choose first?
A. BD B. AC C. BC D. CD E. none of these
Solve.The difference between a country's exports and imports is called the country's trade balance. In 1981, a country had $215 billion in exports and $180 billion in imports. What was the country's trade balance in 1981?
A. 395 billion dollars B. -35 billion dollars C. -395 billion dollars D. 35 billion dollars
Find the equation y = ?0 + ?1x of the least-squares line that best fits the given data points.Data points: (5, -3), (2, 2), (4, 3), (5, 1)X = 
, y = 
A. y = 
- 1x
B. y = 
- 2x
C. y = 
- 
x
D. y = 
+ 
x
Find A-1 if it exists.A = 
A. 
B. 
C. 
D. 