Решить уравнение (арифметическая прогрессия)
1+4+7+...+х=117.

С ответом не сходится, помогите.(
в ответе х=25

Упражнения:

I.                  Дополни
предложения, используя слова в скобках. Ситуация такая: ты вернулся в свой
родной город через много лет и обнаружил, что многое изменилось.

Пример:

Most of my friends were no longer there. They had
left (leave).

(Пояснения: no longer -
"больше не". Most of my friends were no longer there
- Моих друзей больше не было там.)

1.       My best
friend, Kevin, was no longer there. He _____ (go) away.

2.       The local
cinema was no longer open. It ________(close) down.

3.       Mr.
Johnson was no longer alive. He _______ (die).

4.       Bill no
longer had his car. He ________ (sell) it.

II.                закончи
предложения, используя слова never, before, как в примерах, и глаголы в скобках в нужной форме.
(Обрати внимание на порядок слов - never между
вспомогательным и смысловым глаголами,before - в конце
предложения)

Пример:

Mr. And Mrs. Davis were in an airplane. They were very
nervous, when the plane took off, because they (fly) had never flown
before.

1. Jane played tennis yesterday, but she wasn't very
good at it, because she (play) ________________.

2. It was Kate's first driving lesson. She was very
nervous and didn't know what to do. She (drive)
___________.