Multiply.(x - 3y)(-4x + 11y)

A. x2 + 23xy - 33y2
B. x2 + 23xy + 23y2
C. -4x2 + 23xy + 23y2
D. -4x2 + 23xy - 33y2


Answer: D

Mathematics

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Find the flux of the vector field F across the surface S in the indicated direction.F = k ; S is the upper hemisphere of x2 + y2 + z2 = 25; direction is outward

A. - ?
B. ?
C.
D. - 

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Divide.

A. 0.42 B. 4.2 C. 14.2 D. 1.42

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Compute the area of the shaded region. 

A. 80 - ln 9
B. 41 - ln 
C. 40 - ln 
D. 40 - ln 9

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Find the period P, amplitude A, and phase shift S, and graph at least two periods of the equation.y = 4 sin (3x + 60°) 

A. P = 90°, A = 3, S = 15°

 

B. P = 90°, A = 3, S = -15°

 

C. P = 120°, A = 4, S = 20°

 

D. P = 90°, A = 3, S = 15°

 

E. P = , A = 4, S = -20°

 

Mathematics