В арифметической прогрессии a1 = 2, d = - 3. Найти a10 и сумму первых десяти её членов.

Помогите Развитие речи !!!!!! Надо написать мини - сочинение , СРОЧНО !!!!!!!!!!!!!!!!!!!!!!  На тему : " Руск.яз. - яз. нац. меньшинств ли международного общения ? " ИЛИ " Яз., на котором я думаю "

1.Make two passive constructions from one active one.
     1.The librarian gave us  an application form.
     2.They paid him some money for  helping. 

     3.Mike told us  an interesting story.
     4. The Petrovs showed  them a new theatre .
     5.The library sent  me an e-mail.
2. Rewrite the sentences .Use the passive construction.
     1.Everybody always laughs at his  jokes.
     2.They have already sent for the doctor.
     3.People often refer to this book.
     4.We waited for Kate for ten minutes  yesterday.
3. Complete the sentences with the correct prepositions.
     1.I'm not listening to the radio.Turn it ___.
     2.Step forward and don't turn___.
     3.The witch turned  the prince _____ a frog.
     4.Don't turn ____their help.You need it.
     5.Turn ____ the music.I'd like to dance.