Предмет: Алгебра, автор: Михаела123

арифметическая прогрессия задана формулой энного члена c=93-7n найдите первый отрицательный член прогрессии

Ответы

Автор ответа: Emansy
0

так как первый член должен быть отрицательным составим уравнение .

0>93-7n

решим

93<7n

n>93:7

n>14

тоесть начиная с 14 члена прогрессии

и он будет равен -5

Интересные вопросы
Предмет: Английский язык, автор: shevchenkoarsenii220

Writing.
Task 1. Write a short description of your house. Use some of words in the box.- Опиши свой дом. Используй слова в рамочке.

flat, house, bedroom, bathroom, kitchen, dining room, living room, roof wall, window, door, small, big, beautiful, yard, floor, there is…, there are…, the room has…, on the right…


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Reading.
Task 2. Read the email and answer the questions. Прочитай текст и ответь на вопросы.


Hi Chloe,
I have to write to you about this! In Pennsylvania, there is a very unusual
home. It is a house in the shape of a shoe. Yes, a shoe! The shoe house has five floors. It has three bedrooms and two bathrooms. There is also a kitchen and a living room. Outside, there is a beautiful garden with many trees and plants. The house is made of wood and metal. It isn’t a home anymore. You can buy ice-cream there now. You should see it. It is very strange, but I like it.
Bye!
Julie
1 Where is the house?


2 How many rooms has it got?


3 How many floors are there?


4 What is there outside the house?

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5 What is the house made of?



6 What can you do there now?
пж помогите даю 90 баллов​