Please help quickly as possible thank you! :) ​

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

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m