ищу помощи. не сочтите за наглость

1) вычислите острый угол, под которым парабола[tex]y=1/4*x^2-1[/tex] пересекает ось абсцисс

2) доказать что [tex]F(x) = x/3 - 4/x[/tex] является первообразная для [tex]f(x) = x/3 - 4/x^2[/tex] на промежутке [tex](-\infty;0)[/tex]

3) для [tex]f(x) = 3cos2x[/tex] найти первообразную, график которой проходит через A(n/-4;0)

4) вычислить площадь фигуры, ограниченной линиями 

а) [tex]y = x^3[/tex], [tex]y = 0[/tex], [tex]x = 1[/tex] [tex]x=3[/tex]

диагональ правильной четырехугольной призмы равна 2sqrt34 см, а высота равна 6см. вычислить сторону ее основания

Найти ошибки в предложениях:

1)      The tourists have arrived to London three days ago but they haven’t seen nothing interesting still.

2)      Fred told that his farther decided to retire

3)      The mountain stream was deeply and there was difficult to cross it

4)      Henry gave to me several coins and I entered into the large hall hoping to find a public phone there

5)      It is snow everywhere because of it has been snowing at night

6)      Hardly had Ted laid down under a shady tall tree when it started to rain

7)      Laura told that she will look for a more big house

8)      His new film is much speaking about

9)      Don’t be upsetted: the stain can be removed with the warm water

10)   I know you not going to help me: if you were going to do it you will have said me about it long ago

1)      I don’t know nothing about his plans. – So am I

2)      She plays on the piano in a very professionally way,  isn’t she?

3)      I have read this novel when I was in my six form

4)      Have you already finished  to read  this newspaper?

5)      The girls walked about the road discussing about their planned trip to the Moscow

6)      I couldn’t found my dog nowhere; I thinked she must have ran into the wood

7)      Ted suggested to wait Henry in the lobby

8)      I know the car costed fifty thousands dollars

9)      Mark write amusing histories for children

10)   Cancer is dangerous disease, doesn’t it?

1)      Rich does not always understand poor

2)      There isn’t some cheese left in the refrigerator; you should to go to the store and buy some

3)      I wish you believe me more

4)      I can’t to say that yours son is the most bad pupil in the class

5)      I am waiting you since noon

6)      They were often seeing together; everybody know that they were friends since heir early childhood

7)      The villa surrounding by huge old park looked mysteriously

8)      He is far from to be healthy: he can die soon

9)      Ted told that they will have to walk across the wood till they will reach a beautiful lake near which they will camp

10)   We shall miss for the train unless you will not hurry

1)      It is twenty-four kid in bus; everybody are hunger and thirst

2)      The sun is highly already; let us to relax

3)      I am interesting in this issue since I started to work at this company in 1996

4)      I was reading this book in 1999: its author send it me

5)      Toads are as frogs: it is little difference between them

6)      My sister is alike me: she want that I want

7)      This purse is not her: she carry moneys in the pockets

8)      If the bomb will explode all houses on this side of the square will destroy

9)      The landlady holded a letter in hers arms, wasn’t she?

10)   Olga asked the hairdresser do her hairs

Человек в сутки вдыхает в среднем 15 кг воздуха и выдыхает газ, в котором массовая доля оксида углерода (IV) составляет 1% (возможно, в задаче допущена ошибка; в реальности в выдыхаемом воздухе содержится 3-4% углекислого газа). Рассчитайте массу пероксида натрия, необходимого для связывания оксида углерода (IV), который выделяется при двенадцатидневном полёте одного космонавта. Какие недостатки и ограничения имеет этот метод регенерации воздуха? Предложите другие способы регенерации воздуха.