5. The opening of a railway bridge over a roadway is in the form of a tunnel (a parabola). A surveyor measures the heights of three points on the bridge taking xy axes with origin at 0, as shown in the figure below. He wishes to find an equation of the form a0 to model the shape of the parabolic arch. Find (+) (+) L The standard equation of the parabola after calculating the values of a,b and c. The focal length of the parabola. Is it possible for a lorry of height 45.25 ft to pass through the tunnel?