Как записывается уравнение единичной окружности

предположите,почему вельможа и его жена изображены молодыми людьми,хотя,быть может,они умерли в старости

Задача:

Определите массу раствора барий хлорида з массовой частицей BaCl2 10% необходимого для реакции с 48г сульфатной кислоты

(y+25):8=16 помогите решить это уравнение

Помогите пожалуйста.Вставить артикль,где необходимо.1.)1.We have ... large ... family. 2. My granny often tells us ... long ... interesting .. stories. 3. My ... father is ... engineer. He works at ... factory. ... factory is large. 4. My ... mother is ... doctor. She works at ... large ... hospital. She is at ... work now. 5. My ... aunt is ... teacher. She works at ... school. ... school is good. My ... aunt is not at ... school now. She is at ... home. She is drinking ... tea and eating ... jam. ... jam is sweet. I am at ... home, too. I am drinking ... tea and eating ... sandwich. ... sandwich is tasty. 6. My sister is at ... school. She is ... pupil. 7. My cousin has ... big ... black ... cat. My cousin's ... cat has two ... kittens. ... milk, too. cat likes ... milk. ... kittens like

2)1. I am ... engineer. 2. My ... son is ... pupil. 3. He is ... good ... pupil. 4. This is ... house. 5. This is my ... pencil. 6. You have some ... pen¬cils, but I have no ... pencil. Give me ... pencil, please. 7. I like your ... beautiful ... flower. Give me ... flower, please. 8. My ... mother is at ... home. She is reading ... interesting ... book. 9. My ... father is not at ... home. He is at ... work. He is ... doctor. He is ... good ... doctor. He works at ... hospital. ... hospital is large

3)1. When my grandfather was ... young man, he studied ... physics. 2. Do you speak ... Spanish? 3. My uncle is ... great specialist in ... biology. 4. ... Japanese is more difficult than ... French. 5. We listened to ... very interesting lecture on ... English literature yesterday. 6. Yesterday at ... lesson of ... geography ... teacher told us ... very interesting things about ... famous travellers. 7. My father speaks ... English and ... French, but he does not speak ... German. 8. We had ... lesson of ... mathematics yesterday. We wrote ... test-paper in ... mathematics. ... teacher said: "I shall correct... test-papers in ... evening. Tomorrow you will know ... results".