Шарик массой 100г свободно падая на плиту с высоты 1м отскочил на высоту 0,6м определить значение средней силы удара если его длительность сотавила 0,02 с

решите неравенство f(x)<0, если f(x)=-x^3+3x^2-4

как называются реакции протекающие в однородной среде?

Этилен объемом 2,8 л (н.у.) пропустили через раствор перманганата калия. Рассчитайте массу этиленгликоля, который может быть выделен из реакционной смеси.
Помогите, пожалуйста, буду очень благодарна, если можно, поподробнее))

Выбрать правильное окончание предложения.

1.Chicago is a large city, _____?
aren't it
doesn't it
won't it
isn't it

2.What year did you _____ from university?
graduated
graduate
graduating
graduates

3. Do you have _____ to do today? We could have a long lunch if not.
many work
much work
many works
much works

4. That awful accident occurred _____.
before three weeks
three weeks before
three weeks ago
three weeks past

5. They didn't _____ John's plan?
agree with
agree to
agree
agree about

6. Our company didn't pay _____ for that banner advertisement.
a lot of money
not many money
many money
much money

7. I hear you have started a new job. _____ like it? (Test Toefl 2)

How do you
How
What you
What do you

8. "Where _____ last weekend?"
"I went to see my aunt and uncle."
are you go
do you go
have you gone
did you go

9. "Why _____ she isn't speaking to us?"
"We must have done something that upset her. She is just too sensitive."
are you think
are you imagine
do you think
you think
10. _____ times have you seen this product advertised on TV.
how many
how often
how much
many often

11. "Do you know _____ that building is?"
"I would say that it was built at least 100 years ago."
what old
how age
how old
which age

12. I have to have this report finished _____.
by Friday
until Friday
Friday before
Friday beginning

13. Do we have _____ money to buy that computer?
a lot of
many
plenty
enough

14. We saw _____ wild animals while on vacation.
quite a few
quite much
quite little
quite some

15. Are you _____ the competition?
enter
going entering
go to enter
going to enter

16. Ireland was part of the UK, _____?
didn't it
wasn't it
hasn't it
weren't it