В ряд стоят 15 слонов,каждый из которых весит целое число килограммов. если к  весу любого слона,кроме последнего, прибавить удвоенный вес стоящего за ним то получится 15 тон. найдите вес каждого из слонов ( и докажите,что он не может быть другим)

почему биохимические процессы,которые происходят в живых организмах,требуют участия ферментов? помогите..пожалуйста

Put the verbs in brackets into the Past Perfect or Past Simple. After he (get) ready, he (leave) for his office and (start) doing his work as usual. A few hours later Mr Fulham, his boss, (ask) to see him John was nervous. He (think) that his boss would give him some bad news. but he was completely wrong! Mr Fulham (decide) to give John a promotion and he (call) John into his office to give him the good news. He also told him that he was sending him to New York, where he could meet his colleagues from the central office. John (never/feel) so happy in his life. he (decide) that from then on he would start playing more attention to his dreams!помогите пожалуста решить!!! поставьте слова в скобках в Past Perfect или в Past Simple!!! 

какому городу соответствуют координаты: 51 градус 42 минут с.ш и 20 градус 31 минут в.д. 52 градус 30 минут с.ш и 13 градус 25 минут в.д. 30 градус ю.ш и 18 градус 24 минут в.д плиииииз срочно,заранее спасибо большое!!!