прямоугольник площадью 900 кв.м. Какими должны быть его стороны, чтобы периметр оказался наименьшим?

Помогите перевисти. The British Press The British press consists of several kinds of newspapers. The national papers are the ones sold all over the country, with a large circulation, giving general news. There are two main types of national papers - the "popular" papers and the "quality" papers. The popular papers are smaller in size (they are tabloid size), with lots of pictures, big headlines and short articles. They are easy to read and often contain little truthful information. They give much space to opinions. They usually have "human interest" stories - stories about ordinary people and events. Examples of this type of newspapers are "The Daily Mail". "The Sun", etc. "Quality" papers appeal to the more serious reader, who wants to read about politics and foreign affairs. These papers such as "The Daily Telegraph", "The Guardian" are bigger in size (they are called "broad-sheets"), with longer articles and a wider coverage of events. They have different pages for home news, foreign affairs, features articles, fashion, business, sport and so on. People in Britain buy more papers on Sunday than on weekdays. The Sunday papers have a higher circulation than the dailies. As with the dailies, there are both popular and quality Sunday newspapers. The quality ones have different sections and a colour magazine (usually full of advertisements).

How can you characterize the colonists?

в россии всего 400 тысяч предприятий, тогда как в италии их к примеру, 4,5 млн., а в японии 10млн. у нас по- прежнему в загоне мелкий и средний бизнес. почему? дайте аргументированный ответ.

помогите решить методом подстановки 

x-y=1

x+2y=3