1. The problem statement, all variables and given/known data Determine a function for wire between two poles if the arc of the wire is parabola. For every 75m there is 1m of sag. 2. Relevant equations y = a(x-p)^2 + q 3. The attempt at a solution I think that you need to make the lowest point of the wire the origin and hence the resulting equation that needs to be used is y=ax^2 but am unsure what to do from there.