The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (2 sin 5t)i - (10 cos 5t)j + (9 csc 5t)k
A. a
= -50i - 225k
B. a
= 50i + 225k
C. a
= 250j + 225k
D. a
= -50i + 225k
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
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Solve the problem.In the game of Yahtzee, a set of five dice is rolled at once, and the number on each die is observed. What is the size N of the sample space?
A. 56
B. 6!
C. 
D. 65
E. none of these
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Divide. Express the quotient in lowest terms.
÷ 
A. 16
B. 
C. 
D. 
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Solve the problem.Find the area between y = ln x and the x-axis from x = 1 to x = 5.
A. 
B. 5 ln 5 + (-4)
C. ln 5
D. 5 ln 5 - 5
Mathematics