Solve the problem.A radio telescope has a parabolic surface. If it is 9 meters deep and 
wide, how far is the focus from the vertex?
A. 3 m
B. 9 m
C. 4 m
D. 1 m
Answer: D
Mathematics
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Find the angle between the given vectors to the nearest tenth of a degree.a = 
, b = 
A. 68.1° B. 156.2° C. 78.1° D. 166.2°
Mathematics
Find the reciprocal.
A. 1
B. 0
C. 
D. 10
Mathematics
Write the equation in the form y = mx + b.20x + 6y = 19
A. y = 
x - 
B. y = 
x + 
C. y = - 
x + 
D. y = 20x - 19
Mathematics
Find the part.0.4% of 2000 trees
A. 80 trees B. 800 trees C. 0.8 trees D. 8 trees
Mathematics