Find the standard deviation of the data set. Round to 2 decimal places as needed.13, 21, 22, 15
A. 4.43
B. 5.12
C. 5.28
D. 4.19
Answer: A
Mathematics
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Find the length of the indicated portion of the trajectory.r(t) = (2cos t)i + (2sin t)j + 7tk, 0 ? t ? ?/2
A. 
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B. 
?
C. 
?
D. 
?
Mathematics
Simplify.
A. 20 B. 60 C. 10 D. 120
Mathematics
Solve the system by Gauss-Jordan elimination.
?
?
Please enter your answer in the form x = , y = , z = , t = .
What will be an ideal response?
Mathematics
Divide and reduce to lowest terms.
÷ 
A. 
B. z + 3
C. 
D. 
Mathematics