Докажите, что треугольник со сторонами 12 см, 35 см и 37 см является прямоугольным. является прямоугольным

осуществите цепочку превращений Ca->CaCl2->Ca(OH)2->CaCO3->CA(HCO3)2

назовите соли: MgCO3 , AgNO3 BaCL2 NA2SO4 KCL Fe(NO3)3

ответте пож на вопросы
1. What in your view makes parents think that taking drugs is the worst problem teenagers have? Are their fears justified?
2. At what age do friends become of great importance for a child? Does the role of friends change while a child is growing?
3. Are friends as important at an older age as when one is young? Why (not)?
4. Do you agree that having a group of friends is more attractive and safer than having just one close friend?
5. In your experience do big groups of friends tend to fall into couples? Is it natural?
6. Do you think friendship is more important than love? Why (not)?
7. What does friendship give you? Would you like to keep your friends through your life?
8. Are you afraid of being lonely or do you prefer to keep your own company?
9. What should a good friend be like? What weaknesses can you forgive in your friends? How do you understand the saying "Love is blind but friendship closes its eyes"?
10. Can you give an example of true and faithful friends? What makes them such friends?
11. Can you comment on the proverb "A friend in need is a friend indeed"?