Hey bearjr32.

You need to figure out the equation of the parabola which has the form f(x) ax^2 + bx + c = 0.

Hint: You have f(-200) = f(200) = 0 if x = 0 is the middle of the bridge and you also have f(0) = 16.

Can you use this to solve for a, b, and c and get the height at those arbitrary end-points?