как решить уравнение 0,2t+1,7t-0,54=0,22

придумать задачу с выражение (a+b):c и a-a:с

В чем состоят демографические проблемы в РФ (примеры) и их причины

прошу вас помогите пожалуйста

Поставьте глаголы в скобках в правильную форму:Present Continuous или Present Perfect Continuous.

1.       Maria _______________ (learn) English for two years.

2.       Hello, Tom. I _______________ (look) for you all morning. Where have you been?

3.       Why ___________________ (you/look) at me like that? Stop it!

4.       We always go to Ireland for our holidays. We_________ (go) there for years.

5.       I _____________ (think) about what you said and I've decided to take your advice.

6.       "Is Ann on holiday this week?" "No, she _____________ (work).

7.       Sarah is very tired. She _______________ (work) very hard recently.