Find the direction angle ? for the given vector. Let 0° ? ? < 360° and round ? to the nearest tenth when appropriate.

A. 225°
B. 315°
C. 270°
D. 45°

Answer: B

Mathematics

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Perform the indicated operation. Use the form for vectors.u = <13, -11> and v = <8, -12>; Find u ? v.

A. 132 B. -28 C. 236 D. 104

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Express the given function as a composite of functions f and g such that y = f(g(x)).y = 

A. f(x) = , g(x) = - 
B. f(x) = , g(x) = x - 3
C. f(x) = , g(x) = x2 - 3
D. f(x) = , g(x) = x2 - 3

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Find the phase shift of the function.y = -3 cos (4x + ?)

A. 3? units to the right
B.  units to the left
C. 4? units to the right
D.  units to the left

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Find the exact value of the real number y.y = cos-1 

A.
B.
C.
D.

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Mathematics