Please explain the following

discuss the three facts about economic fluctuations. (Chapter 14) explain the causes of short-run economic fluctuations. (Chapter 14) explain how the aggregate demand and aggregate supply model determines equilibrium real GDP and price level, and how changes in the aggregate demand and aggregate supply affect economic growth, inflation, and economic fluctuation. (Chapter 14) explain how monetary policy affects interest rates and aggregate demand in open and closed economies. (Chapter 15)