How to i add fractions? ex-3/6 + 1/6=4/? i really need i forgot how to add them! do i add the bottom or just the top?

Factor the polynomial, if possible. if the polynomial cannot be factored, write prime. 9n^3 + 27n^2 – 25n – 75

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

If angle ase measures 168 degrees, find the measure of angle dse. the figure mag not be drawn to scale