Please help and explain

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

Which best describes a central bank's primary goals? limiting inflation and reducing unemployment reducing unemployment and maintaining cash flow controlling stagflation and reducing unemployment managing credit and ensuring the money supply's liquidity