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gsgshhshsbababa
gsgshhshsbababa
08.06.2021 05:18 •  Алгебра

Рассмотрим функцию y=3x+7 найдем значение функции y при x=2:
y=
теперь найдем значение аргумента x, при котором значение функции y=-11
x=

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Ответ:
Bячеслав
Bячеслав
08.06.2021

Объяснение:

WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.

4,5(64 оценок)
Ответ:
nika99560
nika99560
08.06.2021
Пусть скорость 2-ого = х (км/ч),
тогда скорость 1-ого = (х + 9) км/ч).
Время 2-ого = 990/х (ч),
время 1 -ого = 990/(х + 9) ч
По условию задачи составим уравнение:
990/х - 990/(х + 9) = 1        Общ. знаменатель = х(х + 9)
990(х + 9) - 990х = х^2 + 9x
- x^2 - 9x + 990x + 8910 - 990x = 0
  x^2 + 9x^2 - 8910 = 0
√D = 81 - 4 * - 8910 = 81 + 35640 = 35721;   √D = 189
x1 =( -9 + 189)/2 = 180/2 = 90
x2 = (-9 - 189)/2 = - 99 (не подходит по условию задачи)
х + 9 = 90 + 9 = 99
ответ: 99 км/ч - скорость 1-ого автомобиля.
4,8(98 оценок)
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