Would really appreciate the help. Oh and please tell me how you got the answer.

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

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made

Triangles abd and ace are similar right triangles. witch ratio best explains why the slope of ab is the same as the slope of ac?