определить тип кривой второго порядка и ее основные геометрические характеристики. сделать чертеж.

9x²+9y²=81 

Put the verbs in brackets into Future Simple, Present Simple or Present Continuous. 1. A: I … (see) Roger at seven o’clock tonight. B: Really? I thought he was out of town. 2. A:… (you do) anything on Friday morning? B: No. I’m free. 3. A: I … (go) to the cinema. There’s a new film on. Do you want to come with me? B: What time… (the film start)? 4. A: Helen… (have) a party the ray after tomorrow… (you go)? B: As a matter of fact, I haven’t been invited. 5. A: The new exhibition … (open) on April 3rd and (finish) on May 31st. В: I know. I … (go) on the first day. 6. A: Aunt Maggie… (come) to visit us tomorrow. B: I know. What time… (she arrive)? 7. A: Excuse me, what time… (the train leave)? B: At half past three, madam. 8. A: Michael Jackson … (give) a concert at the Olympic Stadium next week. B: I know. I … (want) to get a ticket. 9. A: I’m really thirsty. B: I … (get) you a glass of water. 10. A: Are you looking forward to your party? B: Yes. I hope everyone… (enjoy) it. 11. A: How old is your sister? B: She… (be) twelve next month. 12. A: What are you doing tonight? B: I … (probably watch) TV after dinner.

Подберите два молекулярных уравнения к ионному уравнению. 

Mn2+ + 2I- =MnI2

2. Какая соль при гидролизе покажет кислую среду?

А) CH3COONa      В) Na2SiO3              С) KNO3         D) FeCl3            E) KI

Составьте уравнения реакции гидролиза соли в молекулярной и ионной форме, укажите характер среды.Сульфит бария

(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)-1/8*3^64

Звуковой анализ слова - язик