Периметр четырех угольника, описанного около окружности, равен 48, две его стороны равны 9 и 23. Найдите большую из оставшихся сторон.

Решите систему уравнений!!!    x-2y=4

                                                           xy=6

в овощном магазине 330кг, яблок и груш. 410 кг. яблок и апельсинов, и 320 кг. груш и апельсинов.сколько фруктов каждого вида в магазине?

Mr Grams: I want to talk to you, Inin. You are the worst tiger, we have ever had! Misha: What? Why am I a tiger, sir? Mr Grams: There are four teams in our school: the Tigers, the Bears, the Sharks and the Foxes. When a new pupil comes to school, he goes into one of the Learns. The teams compete. If you do something good, you earn your team points. If you do something bad, you lose your team points. At the end of the year one team wins and gets a cup. It is very important for everybody at school. Misha: I am sorry, sir, I didn't know about it. sir. Mr Grams: Then I am telling you: "You are a tiger. I am the head of your team and you have already lost us twenty points." Misha: Why have I lost all these points, sir? Mr Grams: You have already been late three times and you've had three detentions. Misha: When was I late, sir? Mr Grains: Well, you were late on Monday, 12 October, on Thursday, 15 October and last Friday. Misha: What should T do now. sir? Mr Grams: You must cam some points for your team. Misha: But how. sir? Mr Grams: There are a lot of activities you can do and earn points. Have you ever done any sports? Misha: Yes, I have. I've done skiing and skating. I did skiing when I was seven and I did skating when I was four. But I gave up years ago. Mr Grams: I think you should look at this list of activities and choose something. Misha: Thank you, sir.

пожалуйста помогите найдите все предложения c Present Perfect и Past Simple

-2x+16=5x-19              3+11y=203+y