Provide an appropriate response.Determine the quadrants in which the given point (x, y) may lie when xy > 0.
A. II or IV
B. I or III
C. II or III
D. I or II
Answer: B
Mathematics
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Solve the problem.On a day of trading, the Dow Jones Industrial Average increased by 573 points to close at 1629. What was the value of the Dow when trading began that day?
A. 2102 points B. 956 points C. 2202 points D. 1056 points
Mathematics
Provide an appropriate response.The life expectancy (in hours) of a fluorescent tube is normally distributed with mean 7,000 and standard deviation 1,000. Find the probability that a tube lasts for more than 8,900 hours.
A. 0.0281 B. 0.9719 C. 0.0287 D. 0.9713
Mathematics
Perform the row operation(s) on the given augmented matrix.R2 = 2r1 + r2 
A. 
B. 
C. 
D. 
Mathematics
Compute the determinant of the matrix by cofactor expansion.
A. 27 B. -1 C. 1 D. 0
Mathematics