скільки коренів має рівняння:(х²+6х)²-5(х²+6х)=14

Объясните почему в данных словах пишется одна и две нн- плетеное, ржаная, сломана, погашенный, муравьиный, небеленный, сеянный, туманна?

. Закончите предложения, использовав один из предложенных глаголов во времени Present Perfect (have/has+3 форма глагола).

break, buу, finish, do, go, lose, go, paint, read, take.

1. “Are they still having dinner?”        “No, they have finished”.

2. I                                   some new shoes. Do you want to see then?

3. “Is Tom here?”   “No, he                                 to work”.

4. “                           you                           the shopping?

    “No, I’m going to do it later”.                   

5. “Where's you key?”   “I don't know.  I                                 it”.

6. Look! Somebody                                   that window.

7. Your house looks different.                         you                          it?

8. I can't find my umbrella.  Somebody                                     it.

9. I'm looking for Ann. Where                         she                            ?

10. “Do you want the newspaper?”  “No, thanks.

    I                                              it”.