Solve the problem.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 10 m down from the top of the dome the ceiling is 19 m wide, find the best location for the light source.
A. 6.9 m down from the top
B. 9 m down from the top
C. 2.3 m down from the top
D. 4.6 m down from the top
Answer: C
Mathematics
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A. xy - 5 + 
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C. x2y2 - 5 + 12xy
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Mathematics