В баскетбольной команде 10 игроков.После каждой встречи игроки обеих команд пожимают друг другу руки.Сколько всего рукопожатий можно насчитать после игры?

Как придумать и решить задачу в 4 действия про кг,гр(если не знаете,то можете и про метры,дм,см...)всё равно лишним не будет

Через кипятильник проходит ток силой 3 ампера. Определите кол-во теплоты, вылеляемое спиралью кипятильника за 20 минут работы, если электрическое сопротивление спирали равно 30 Ом. ОЧЕНЬ СРОЧНО

Упражнение№ 1. Раскройте скобки употребив глагол в Present Perfect. 1. John (write) his name. 2. I (draw) a picture. 3. Tom (blow out ) the light. 4. The cat (drink) its milk. 5. The tree (fall) across the road. 6. John (give) his bicycle to his brother. 7. You (make) a mistake. 8. We (eat) our dinner. 9. The train just (go). 10. I just (tell) the answer. 11. George never (be) in Australia. 12. John and Richard just (go away). 13. The baker (sell) all his cakes. 14. I (read) this book.

Упражнение№ 2. - Переведите предложения. - Задайте общий вопрос. - Ответьте "Yes,… No,…" 1. Jack has washed the dog. 2. Father has already cleaned his car. 3. Mr Pirson has made a speech at the conference. 4. Granny has bought me some cakes. 5. They have painted their old house. 6. Liz has bought some flowers. 7. My sister has just cooked breakfast for the family. 8. The cat has already eaten fish. 9. Mrs Gracy have gone to London. 10. I have never been to India. 11. She has just broken a vase. 12. We have cleaned the room. 13. Nick has phoned his friend. 14. The train has just arrived. 15. The snow has just started . 16. Kelly has gone to America. 17. We have left our books at home. 18. The street has changed a lot. 19. You have worked here for a long time. 20. Mandy has been ill for a month.