Decide whether the equation describes a function.x + 7y = 7
A. yes
B. no
Answer: A
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An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest position after t seconds. Also assume that the positive direction of the motion is up.a = 19;
T = 10 seconds
A. d = -10 cos 
B. d = -19 cos 
C. d = -19 cos 
D. d = -19 sin 
Find the phase shift of the function.y = 3 cos (4x + ?)
A. 3? units to the right
B. 4? units to the right
C. 
units to the left
D. 
units to the left
Give the domain of the function.f(x) = 
A. 
B. 
? 
C. [0, ?)
D. (-?, ?)
Write the following as a complex number in standard form a + bi.
A. 0 + 7i B. 7 + 7i C. 7 + 0i D. -7 + i