Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 45 ft and the vertical clearance must be 30 ft at a point 5 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: B
Mathematics
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