Назовите столицу самого крупного государства Южной Америки ??? И ПОЧЕМУ?

Найдите площадь поверхности правильной четырехугольной пирамиды,стороны основания которой равны 8 и высота равна 3

Помогите с Английским 8 класс.Очень нужно! Упр. 301. Передайте следующие специальные вопросы в косвенной речи. 1. I said to Nick: "Where are you going?" 2. I ! said to him: "How long are you going to stay there?" 3. I said to him: "How long will it take you to get .there?" 4. Pete said to his friends: "When are you Cleaving St. Petersburg?" 5. He said to them: "Who will you see before you leave here?" 6. They said to him: "What time does the train start?" 7. Ann said to Mike: "When did you leave London?" 8. She said to Boris: "When Will you be back home?" 9. Boris said to them: "How can I get to the rail­way station?" 10. Mary asked Tom: "What time will you come here tomorrow?" 11, She asked me: "Why didn't you come here yesterday?" 12. She asked me: "What will you do tomorrow if you are not busy at your office?" 13.1 asked Mike: "What will you do after dinner?" 14. I asked my uncle: "How long did you stay in the Crimea?" 15. Ada said to me: "Where did you see such trees?" 16. I said to Becky: "What kind of book has your friend brought you?" 17. Mother said to me: "Who has brought this parcel?" 18. He said to her: "Where do you usually spend your summer holidays?"

при каком значении p уравнение 4x² + px + 9 = 0 имеет один корень?

Два пешехода вышли одновременно навтсречу друг другу из двух пункток,расстояние между которыми 5 км.Скорость первого пешехода состовляет 2/3 скорости второго.Найдите скорости каждого пешехода,если они встретились через полчаса.

Очееень прошу решите!!!!