1 киловатт-час электроэнергии стоит 3 рубля 50 копеек. Счётчик электроэнергии 1 января показывал 88742 киловатт-час, а 1 февраля показывал 88940 киловатт-часов. Сколько рублей нужно заплатить за электроэнергию за январь?

Грамматическая основа предложения "Три окошка на девятом этаже над квартирой Хлопковых неуютно темнели" ? Вопрос из сборника ГИА.

1. Look! A new hospital (build) near the airport.

Look! A new hospital had been built near the airport. (Passive Past Perfect)

2. Where these photographs (take)? In London? You (take) them?

Where these photographs will have been taking? In London? You will have been taking  them?(Active Future Perfect Progressive)

3. Two people (arrest) last night.

Two people were being arrested last night. (Passive Past Progressive)

4. The computer broke down yesterday, but now it's OK. It (work) again. It (repair).

The computer broke down yesterday, but now it's OK. It has worked again. (Active Present  Perfect) It had repaired. (Active Past  Perfect)

5. The man  next door (disappear) six months ago. Nobody (see) him since then.

The man  next door had disappeared six months ago. Nobody had seen him since then. (Active Past  Perfect)

6. The room looked nice. It (clean).

The room looked nice. It is cleaning. (Active Present  Progressive)

7. There's somebody walking behind us. I think we (follow).

There's somebody walking behind us. I think we are following. (Active Present  Progressive)

8. A mystery is something that can't (explain).

A mystery is something that can't will have been explaining. (Active Future Perfect Progressive)

9. I'm sure that by the time we come to the theatre, all the tickets already (sell).

I'm sure that by the time we come to the theatre, all the tickets already had been sold. (Passive Past Perfect)

cosxcos3x=-1/2 Помогите решить пожалуйста очень срочно!!!!!!!!!!!!!!!!!

Набирая номер телефона состоящий из 7 цифор абонент забыл в какой последовательности идут три последнии цифры. Помня лишь что это 1, 5 и 9, он набрал первые четыре цифры, которые знал, и наугад комбинацию 1, 5 и 9. Какова вероятность того, что абонент набрал правильный номер?