Find the center, foci, and vertices of the ellipse.
+ 
= 1
A. center at (0, 0)
foci at (- 
, 0) and (
, 0)
vertices at (-5, 0), (5, 0)
B. center at (0, 0)
foci at (0, - 
) and (0, 
)
vertices at (0, -5), (0, 5)
C. center at (0, 0)
foci at (0, -2) and (0, 2)
vertices at (0, -4), (0, 4)
D. center at (0, 0)
foci at (-5, 0) and (5, 0)
vertices at (-25, 0), (25, 0)
Answer: A
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Express the vector in the form v = v1i + v2j + v3k.5u - 3v if u = 
and v = 
A. v = -4i + 5j - 3k B. v = 5i + 5j - 3k C. v = 14i + 5j - 3k D. v = -4i + 8j - 3k
Perform the indicated operation. Simplify, if possible.
+ 
- 
A. 
B. 
C. 
D. 
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 744. Find a linear equation which fits this data, and which relates score to review time. Use this equation to predict an average score for persons taking a 43-hour review course. Round your answer to the tenths place.
A. 664.5 B. 653.0 C. 674.3 D. 660.3
Find the standard deviation s for the given data. Round your answer to one more decimal place than the original data.The normal monthly precipitation (in inches) for August is listed for 12 different U.S. cities.3.51.62.43.74.13.91.03.64.23.43.72.2Compute the standard deviation.
A. 1.09 B. 1.05 C. 12.03 D. 1.00