Поблёскивали молнии и кругом грохотало (знаки препинания))*************

Один из углов ромба равен 120, а его меньшая диагональ  равна 4,5 см. Найдите периметр ромба. 

а) 27см   б)15см         в) 18см  г)21,5

Cвятослав разгромив Волжскую Болгарию и Хазарию открыл путь ордам:
а)скифов б) гуннов в) черемисов г)половцев

пожалуйста перевидите текст правильно:Singing club-We invite you to our singing classes. Lets sing the most popular songs together.Itll be col! Travellers club-Do you like to travel?Then you are welcome to our club.We go sightseeing and study the history and traditions of our countries.Get the map,make the plan and go! Nature club-Would you like to be a naturalist?Come and grow exotik plants and beautiful flowers and even save wild animals!Well teach youhow to take care of pets too.Lets save the planet together! Tennis club-All you need is a racket and a ball!Lets play!We need strong and clever boys and girls who sports! Water world-Do you like to swim?Our big swimming pool is waiting for you!You will become the best swimmer. Faster,higher,stronger-If you want to run fast,jumphig,and be strong,our athletics club is for you.East or west,sport is best! Musicians club-Come and play the pian o(volin,guitar,drums)or choose from many ofther instrunents!Lets make the shool orchestra together! Shool theatre-Theatre is one of the best arts!Show us the actor in you!Come and create a play with us! Photofraphy-Take the best photo of the month and get a fantastic prize!A new camera!Show off your artistic side! Chees club-So you like playing chees and you want to be a chess master?Play a chees match with a champion.Come and show us your skill! Computer club-We cant imagine a world without computers.Make the world a more creative place with our modern computer program. Drawing club-Do you like draw?do oyu want to become an artist?We ll help you improve your drawings. Dancing club-Are you a dancer?Master your dance sters in classical,modern,folk,aerobic and even dreack-dancing.With a modern studio and master classes youll have all you need.

Некоторые углеводороды при действии избытка Br образует дибром производное содержащее 57.5% брома по массе. Это же соединение при кипячении с перманганатом калия присутствие H2SO4 образуют одноосновные карб. кислоты.
Определить: ф-лу и структ. ф-лу углеводорода. Написать уравнение процессов описанных в условиях.