Can anyone please help me

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

Say a certain manufacturing industry has 63.1 thousand jobs in 2008, but is expected to decline at an average annual rate of 1.7 thousand jobs per year from 2008 to 2018. assuming this holds true, what will be this industry’s percent change from 2008 to 2018? a. 70% b. -27% c. -17% d. -75%

What is the main responsiblity of a party oranization?