Человек нажимает на лопату силой 600H.Какое давление оказывает лопата на почву,если ширина её лезвия 20 см,а толщина режущего края 0,5 мм?Зачем лопаты остро затачивают?

Решите уравнение:

3*(х +0,6) = 3-х.

СПАСИБО)))))

Нужна помощь,срочно! :) 
Надо вставить пропущенные слова. Заранее спасибо.

Most children attend public schools which 1)__  by the government, though some children attend 2)__ schools. There are some children who 3)__  at home by their parents. These children 4)__  to be home schooled. In general, Canadian children start their first grade when they are six years old; some of them attend kindergarten for one to two years before Grade 1, it is 5)__. The school year runs 6)__  September each year 7)__ June of the next year.

Students in high school begin to decide what they want to do with the rest of their lives. In Grades 11 and 12, students in Ontario 8)__  to choose from workplace preparation, university/college preparation, college preparation, an university preparation courses.

Students in almost all provinces and territories must attend school 9)__ they are 16. But most students stay 9)__  till they get a diploma after their 11th, 12th or 13th Grade depending on the province they are living in. After high school completion, students can choose to 10)__ their education in university, college or Cegep. Cegep is from French for College of General and Vocational Education and it is between 11)__  of university general studies or three years of vocational studies and high school.
1) controlled; is controlling; are controlled
2) private; comprehensive; elementary
3) is taught; learn; are taught
4) say; are said; are saying
5) optional; compulsory; extracurricular
6) in ...to;  from ... till;  as ... as
7) are able;  can;  must
8) until;  to;  before

9) further;  longer;  more
10) start;  finish;  continue
11) the first two years';   the first two years;  first two years 

До нового года маша посмотрела 216 серий мультсериала, а после нового года на 74 меньше. Ей не удалось посмотреть 42 серии. сколько серий в мультсериале?