The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (5 sin 5t)i - (4 cos 5t)j + (4 csc 5t)k
A. a
= 125i + 100k
B. a
= 100j + 100k
C. a
= -125i - 100k
D. a
= -125i + 100k
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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A. 
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C. 
D. 
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Find E ( X ), Var ( X ), and SD( X ) for the given random variable
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