I need help please fast

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

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?