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    Modelling an underpass | 
  2010-05-11 | 
   
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  From Sue: An engineer at the Ministry of Transport is creating the plans for a new road. This road
will cross the path of a busy railway track so it will be necessary to built an underpass for this road.
This underpass will be in the shape of a parabolic arch.
  
The specifications include: 
-the road must be at least 10 m wide and it must have shoulders at least 2 m wide on either 
side of the road.  
-there must be a clearance of 3 m over all areas of the road.  
  
What quadratic equation could you use to model this bridge. Answered by Penny Nom. | 
   
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