Find u ? v, where ? is the angle between the vectors u and v. Round the answer to the nearest tenth.
= 6, 
= 6, ? = 
A. 31.2
B. 72
C. 42
D. 18
Answer: D
Mathematics
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Write as a percent. Round to the nearest hundredth of a percent when necessary.
A. 4.25 % B. 2.35 % C. 23.53 % D. 42.5 %
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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
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Use estimation to determine which calculation is incorrect.
A. 
B. 
C. 
D. 
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Solve the problem.A railroad tunnel is shaped like a semiellipse. The height of the tunnel at the center is 15 ft and the vertical clearance must be 
at a point 
from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
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