The length of a rectangular piece of steel in a bridge is 3 meters less than double the width. the perimeter of the piece of steel is 24 meters. find the length of the piece of steel. find the width of the piece of steel.

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.