The Akashi Kaikyo Bridge was completed in Japan in 1998 (Fig. 1). With its enormous 1991 m span between its two piers, it is one of the longest bridges in the world. The arch between the piers can be approximated by a parabola with y = 0.000 203 (x - 995.5)2 + 15.
Here, x (in m) is the horizontal distance to the left pier and y (in m) is the height (relative to the road)
of the arch. What is the greatest and smallest height of the arch?
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