Need help if you can.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

Find the values of y: 3y^3(y^2+ 2/3y)=0