Please can get help in these questions?

I = En It = (En) Consider the inflation-expectation model represented in the diagram above. The Bank announces an inflation rate, people form rational expectations, and then the Bank decides what inflation rate to implement. The Bank's preferred inflation rate (as a function of expectations) is represented by the orange line and the public's expectations by the green line. 1. Explain: Why does the orange line have a positive slope? 2. What determines the slope of the green line, and why? 3. What is the equilibrium unemployment rate? Explain