укажите в словах мягкие согласные конь,стальной,хвост,льняной

Решить уравнение: cost=-0,5; cost=-2  вычилить: sin( arcoos0) б) arccos ( tg пи на 4) помогите пожалуйста 

Пожалуйста помогите, прям очень-очень срочно!)))

Заранее спасибо)

Complete the sentences . Use the negative form of the verb.

Example: We had talks on Tuesday but we didn't discuss the terms of payment.

1.I looked through some newspapers but I ...

2.I went to the bank but I ...

3.We met out suppliers but we ...

4.The businessmen discussed the prices but they ...

5. The manager received some catalogues but he ...

6.Mr Blake was busy on Thursday but he...

7.I spoke on the phone with my (sister) but I ...

8. The director went on business to New York but he ...

9. The children watched TV in the afternoon but they...

Complete the sentences.Indicate the time.

1. Our company made some contracts ...

2. I left the office ...

3. We invited some friends to dinner ...

4. Mr Blake visited Moscow...

5. We stayed at home and watched TV...

6. There were some terrorist acts in Russia ...

7. My friend played football (tennis, voleyball) when ...

8. I went out for lunch ...

Рабочий за определённый срок должен был изготовить 3600 деталей. Поскольку в день он изготавливал на 20 деталей больше, чем рассчитывал, то выполнил заказ на 6 дней раньше. За сколько дней был выполнен заказ?