письмо баху или бетховену от современника

помогите найти первообразную для 7x+1 (все это под корнем)ответ знаю,мне нужен ход решения(

найти пропущенные числа : 21:3= :2 , 12:2= :3 плиз)))))

passive forms .

yesterday when i returned home mr wilkins (to call ) by your secretary ,but unfortunately at that moment your partner was away.But dont you worry, sir .Mr Wilkins (inform) either today or tomorrow. They hall(decorate)at the moment and the curtains(wash).i think they(hang)on the windows in the evening already we think that can(do) a little later.the flowers (buy)on Friday ,sir. i m sure everything (do)sir,when you come