I can't log into your photobucket, (needs password)
so I will "guess" at a diagram
expanding and simplifying your equation I got
y = (-1/625)x^ + 400
b) at the centre, x = 0
so y = 400
the bridge is 400 ft high
width of bridge, let y = 0 (on the x-axis)
0 = (-1/625)x^2 + 400
x^2 = (625)(400)
x = ±25(20) = ±500
So the bridge is 1000 ft wide
for vertical girders
let x = 100, 200, 300 , 400
x = 100
y = (-1/625)(100)^2 + 400 = 384
x = 200
y = (-1/625)(200)^2 + 400 = 336
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