The lower arch of the Sydney Harbour Bridge can be modelled using the equation y = -0.00188(x - 251.5)3 + 118 Assuming Sydney Tower is 1km from the far side of the bridge, prove that Sydney Tower will first be visible from the arch at x = 207.81m. The point of Sydney Tower is 327m above sea level. Use the calculus techniques you have learnt to complete this task. - Remember not to round until the end of your calculations