Question 1175726
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Hi
An arch is in the shape of a parabola. 
It has a span of 208 meters and a maximum height of 26 meters.
 y = ax^2 + 26   (Sry, no clue where the 42 came from)
  a = -26/(104)^2 = -25/10816 = -1/416
 y = {{{((-1/416))(x)^2 + 26m }}}
 y(55) =  18.73m rounded to nearest hundredth

Wish You the Best in your Studies.
    {{{drawing(300,300, -150,150,-50,50,  
 grid(1),
circle(104,0,0.4),
circle(-104,0,0.4),
graph( 300, 300,  -150,150,-50,50,  0,(-1/416)(x)^2 + 26 ))}}}

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