докажите , что для любого вектора а справедливо равенство а+0=а.

Проверьте грамматику и орфографии плиз в моем сочинение. Пожалуйста исправьте, если они есть. Спасибо большое!

Историю нужно начать именно с этого предложения "She shut the door and picked up the telephone."

She shut the door and picked up the telephone. Then she was hearing a familiar voice, but she couldn’t recognize it of the speaker. She continued to listen to the phone and she didn’t interrupt the talking. The woman was standing at the window and suddenly her face began to change. After two minutes she started crying and felt the talker was expressing something terrible. 
All the story started happening two years ago, when in one day the student of Medicine university, whose name was Alice, had met a perfect man, whose name was Alex. She had fell in love with him, and they were spending much free times for them. 
After some time, Alex needed leaving the city, because his father was ill in America and he had to die soon. The young man promised his sweet before leaving return as soon as possible. She said to him: " When you will in America, you don't forget to phone me. I afraid of losing you."
As soon as he had got a ticket, Alex began packing the suitcases and arrived on the airport. The airplane started the flying. When the plane had gone some way, it took the accident. Many people were injured, but the Alex's trauma was fatal, and he died. After this catostrofy the best friend of Alex phone to Alice, and she almost lost consciousness. She felt alone.

составте план своего рассказа Отечественой войны 1812 года

1)Название какого раздела математике происходит от греческого слова" число" 2)Рассказывают, что в возрасте 10 лет он удивил учителя, быстро сложив все числа от 1 до 100. Назови этого немецкого математика. 3)Это слово имеет латинское происхождение, означающее "лен, льняная нить, шнур, верёвка". Назовите это слово в том значении, в котором мы употребляем его в математике. 4) Современные цифры0,1,2,3,4,5,6,7,8,9 называют арабскими. У народов какой страны эти цифры позаимствовали арабы?

Корень в словах: грустный,весёлый,лёгкий,тяжёлый, редкий, частый,узкий, широкий, поздний,ранний