Find the foci of the hyperbola.49y2 - 81x2 - 3969 = 0
A. (0, -
) and (0, 
)
B. (0, -4
) and (0, 4
)
C. (0, -9) and (0, 9)
D. (-
, 0) and (
, 0)
Answer: A
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Find the flux of the vector field F across the surface S in the indicated direction.F = 2x2j - z2k; S is the portion of the parabolic cylinder y = 4x2 for which 0 ? z ? 4 and -2 ? x ? 2; direction is outward (away from the y-z plane)
A. - 
B. 
C. -128
D. 128
Evaluate the expressing using a unit circle or state that the quantity is undefined. All angles are in radians.tan 
A. - 
B. - 
C. 
D. 
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
Use a differential to approximate the quantity to the nearest thousandth.
?
?
A. 
B. 
C. 