В треугольнике АВС внешний угол при вершине А равен 123 градуса, а внешний угол при вершине В равен 63 градуса,Найдите угол С треугольника АВС. Ответ дайте в градусах.

напишите уравнение реакций ионного обмена приводящих к образованию 

бромида серебра
иодида серебра  

к серной кислоте прилили раствор , содержащий 10.4 хлорида бария. Определите массу осадка

1. They go to school together in the morning, and always        at the same time. a) get up b) got up c) gets up d) has gotten up 2. Tina is a good student, but she always                   about her grades. a) worry b) worrys c) worries d) worried 3. Have you visited any European countries? - Yes. I                  Spain and Italy two years ago. a) visited b) have visited c) had visited 4. I went to Belgium last month. I             there before. It's a beautiful country. a) have never been b) had never been c) never was 5.1 love this film. I           it four or five times already. a) see b) have seen c) had seen 6. OK, I         the car. We can go. a) repairs b) repaired c) have repaired 7. She         lunch by the time we arrived. a) had finished b) finished c) have finished 8 .          you ever         to Hollywood? a) Did ... go b) Have ... go c) Have .. gone 9. Would you mind            me a hand? a) to give b) give c) giving 10. If she that he was coming, she          would have prepared the guest room. a) knew b) has known c) had know 

Оля и её подруга Света вышли из своих домов навстречу друг другу в 8 часов утра и встретились у школы в 8 часов 15 мин. Скольковремени до встречи шла каждая из девочек?