Can someone please help me? I am having a-lot of trouble!

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

I'm confused on this could anyone me and show me what i need to do to solve it.

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