периметр равнобедренного треугольника равен 80см а высота опущенная на основание 20 см найдите основание?

расстояние между автобусом и автомобилем идущими навстречу друг к другу 1008км средняя скорость автобуса 48км/ч а скорость автомобиля в 2 раза больше через сколько часов они встретятся

I (А9) ... a night last December when everything went wrong for me. I (A10) ... to a party, but I didn't check the date and time before I left home. Hardly (All) ... at my friend's house when I knew there wassomething wrong - nobody was there. The neighbours looked at me in surprise and said: "Don't you know that the Winkles (A12) ... on holiday and they (A13) ... back until the end of January?" There was no point in hanging around, so I decided to drive home. After about a mile, the car stopped. All of a sudden I (A14) ... out of petrol. What's more, I had to walk two miles before I found a petrol station. While I (A15) ... for some petrol, I started talking to a girl in the queue. Just as I was about to pay, I realized I (A16) ... my wallet at home. The girl who (A17) ... Marie, offered to give me a lift in her car. Unfortunately, it was an old car, and as soon as we left the petrol station it (A18) ... down! Marie had to pay for a taxi for both of us. A9.

А9.

1) remember

2) was remembering

3) had remembered

4) have been remembering

А10.

1) invited

2) had been invited

3) have been invited

4) was inviting

А11.

1) I arrived

2) I have arrived

3) was I arrived

4) had I arrived

А12.

1) had gone

2) are going

3) have gone

4) have been going

А13.

1) will be

2) aren't

3) won't be

4) have been

А14.

1) have run

2) ran

3) run

4) had been running

А15.

1) was waiting

2) was waited

3) have been waited

4) had been waiting

А16.

1) had been left

2) have left

3) had left

4) was leaving

А17.

1) called

2) was calling

3) had called

4) was called

А18.

1) has broken

2) was breaking

3) broke

4) had been broken