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 = 18 cos(2?x + bt)
B. y = 9 cos(2?x + bt)
C. y = 9 cos(2?x - bt)
D. y = cos(2?x - bt)
Answer: C
Mathematics
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Write the mixed number as a decimal.15
A. 15.
B. 15.
C. 15.3
D. 15.33
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The position vector of a particle is r(t). Find the requested vector.The velocity at t = 0 for r(t) = cos(4t)i + 7ln(t - 5)j - 
k
A. v(0) = -
j
B. v(0) = 
j
C. v(0) = -4i - 
j
D. v(0) = 4i - 
j
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Express the following decimal as a rational number. ? 2.251251251...
What will be an ideal response?
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Determine whether there is a maximum or minimum value for the given function, and find that value.f(x) = x2 + 4x + 3
A. Minimum: -1 B. Maximum: -1 C. Maximum: 1 D. Minimum: 0
Mathematics