На столе лежала пачка тетрадей. Сначала взяли 30% этих тетрадей, а потом 75% оставшихся тетрадей. После этого на столе осталось 14 тетрадей. Сколько тетрадей было в пачке первоначально?

скорость распространения света в первой прозрачной среде составляет 225000 км/с, а во второй- 200000 км/с. Луч света падает на поверхность раздела этих сред под углом 30 градусов и переходит во вторую среду. Определить угол преломления луча.

х-0,735

_______=5

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НАДО НЕМНОЖКО ИЗМЕНИТЬ ТЕКСТ ЧТОБЫ УЧИТЕЛЬНИЦА НЕ УЗНАЛА ЧТО Я СПИСАО С ГДЗ  !!!ПОМОГИТЕ ПОЖАЛУЙСТА !!!

Suggested Answer Key
Dear Mr Johnson,
With reference to your advertisement, in an
international student’s magazine, I would like
to apply for a volunteer position.
I am a fifteen-year-old student currently
attending middle school. I really enjoy
working with children. I hope to study
education and become a teacher. I have just
passed the Pet English exam with a grade A. At
school, I am involved in a variety of sports
teams and clubs including the psychology club.
I am described by my fellow students and
teachers as sociable, caring and creative.
Furthermore, I volunteer every week as a
group leader at a youth centre in my
neighbourhood, where I coordinate different
activities and sports for children of all ages.
From this experience I have learned to
communicate well with young people and
understand their needs. In addition to my
volunteer work, I do babysitting for some of
the families in my neighbourhood.
I have attached my application form and
references. I would be grateful if you would
consider me as a volunteer. I can be contacted
at the number on my application form at any
time. I look forward to hearing from you.
Yours sincerely,
Tara Rulstan