дана арифметическая прогрессия {a^n}Вычислите сумму 8 членов, если A^13=79, d=5

По учебнику New Oppotunities Pre-Intermediate стр 126 № 3

Рассказ: The picture of Dorian Gray/

1. Doian made his wish because he..

a)was extremely handsome. b)was in love with a girl. c)wanted to stay young/

2.Over the years,Dorian..

a)didn`t change physically. b)became more handsome.

c)forgot about the picture

3)Dorian killed Basil because Basil..

a)became very angry. b) wanted to buy the portrait. c)told him to change his life.

4)The sailor followed Dorian because he...

a)wanted to see his face. b)wanted to kill him. c) was afraid of him.

5)Dorian destroyed the picture because he..

a)wanted to kill himselfs. b) thought it was horrible.

c)wanted to become old.

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или № 4:

What you think is the moral of this story(Dorian Gray)?Do you agree with it?

В фирме «Эх, прокачу!» стоимость поездки на такси (в рублях) рассчитывается по формуле C=150+11*(t-5) , где t — длительность поездки, выраженная в минутах (t> 5). Пользуясь этой формулой, рассчитайте стоимость15-минутной поездки.как тут ответ 260?объясните плииз(

диоганали ромба равны  8 и 6 см.Надо найти стороны ромба.Помогите,я в долгу не останусь!