какая основная причина низких температур в полярных областях Земли

СРОЧНО ПОМОГИТЕ !!!!!!!!!!!!!!!!!!!

Which activities can these sentences be about?

1)I usually do this activity alone.____

2) I usually do this activity with other people._____

3) I spend money when I do this activity.____

4) Many people in my country enjoy this.___

5) I must use special equipment (guitar, skis, etc.)._____

6) This activity is noisy.____

7) This activity is quiet.____

8) This activity is a bad for my health._____

9) This activity is a good for my health._____

10) This activity can be dangerous._____

11) I must think a lot to do this activity.___

х+у=7 ху=10 решение система

Первый принтер за 5 мин распечатывает 41 страницу, второй принтер за 3 мин.распечатывает 28 страниц. У какого принтера производительность работы больше?