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при каких значениях а уравнение х^2-зх+а+4=0 имеет ровно один корень(два равных корня)?

Vocabulary. Here are some expressions that can be used to talk about school.

1. Match the expression and its meaning.

1). to go to school...

2). to take exams/tests...

3). to pass exams/tests...

4). to fail exams...

5). to be at school...

6). to be in school...

7). to be in the school...

A. to attend a school, not a college or a university or have a job.

B. to be in the school building for any other reason except studying.

C. to be in the school building to study.

D. to have a good mark in exams or tests.

E. to attend school regularly.

F. to do exams.

G. to get a very bad mark in exams.

2. Fill in the gaps with the expression or part of the expression from ex. 1 in thecorrect form.

1). Are you still _____ or at university?

2). Jason didn't work hard and _____ the exams.

3). Everyone who wants to join an excursion should be _____ at 4 pm.

4). At the end of this year I _____ three _____. I got all good marks.

5). This year you _____ in 4 subjects, won't you?

6). 5-year-old children do a lot of interesting things _____.

7). What _____ do you go _____?