Дан прямоугольный треугольник ABC с гипотенузой АС= 13 см и катетом ВС= 5 см. От­резок SA =12 см, - перпендикуляр к плоскости AВС.

а) Найдите  \ ‌ ‌AS + SC + СВ \ ; б) Найдите угол между прямой SB и плоскостью ABC.

приведите пожалуйста 3 примера биотических взаимодействий , заранее спасибо.

стороны паралелограма 10 и 15 см, а один из его углов 150 градусов.Надо найти площадь паралелограма

Заполните промежутки кто, который, где, чей, или это.

1 I received a letter this morning ……………… really upset me.

2 Toby, a boy ……………… I went to school with, is ill in hospital.

3 He's going to have an operation ……………… could save his life.

4 Toby, ……………… parents both died a few years ago, is the same age as me.

5 I recently went back to the town ……………… I was born.

6 The people ……………… used to live next door moved a long time ago.

7 I met a girl ……………… I used to go out with.

8 She told me a story ……………… I found hard to believe.

9 She said she'd married a man ……………… had been married ten times before. 10 Apparently, he lost all his money gambling, ……………… really annoyed her.

Написать ответное письмо на АНГЛИЙСКОМ! сказав о этих 2 темах ОБЯЗАТЕЛЬНО 2 темы: 1)You do not find the idea of karate very attractive;2)Your grandmother is getting better;

" Dear Bob

I just got your letter. When are you coming back home? I hope that your grandmother is much is much better now and can do without your help. We are all missing you.
I am taking karate classes and enjoying them. When you come, you can do karate with me. We have a wonderful instructor!
Say hello to your grandmother,

                                                                                                 Alice"