Solve the problem.A vibrating wire has a vertical displacement given by 
Assume b and t are constants. Write y as a cosine function of x.
A. y = 8 cos(2?x + bt)
B. y = 4 cos(2?x - bt)
C. y = cos(2?x - bt)
D. y = 4 cos(2?x + bt)
Answer: B
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Graph the basic function using a solid line and the transformed function using a dotted line.f(x) = x2 - 4
A. 
B. 
C. 
D. 
Which of the following is a definition of a dilation? ?
A. ?The shape maintains its proportionality but shrinks/grows in size. B. ?The shape undergoes a rigid transformation. C. ?The shape translates horizontally or vertically, and flips. D. ?The shape changes its proportionality as it moves vertically, horizontally, or diagonally. E. ?The shape rotates 90?, maintaining a rigid transformation.
Solve. Write the solution set using set-builder notation and using interval notation. Graph the solution set. a - 10 < -21
A. {a
a > -11}; (-11, ?)
B. {a
a ? -11}; [-11, ?)
C. {a
a < -11}; (-?, -11)
D. {a
a ? -11}; (-?, -11]
Graph the parabola.y = - 
(x - 5)2 - 3
A. 
B. 
C. 
D. 