(log по основанию (2/корень 5) из числа (5x/5x-1))<0

Арифметическая прогрессия задана формулои n-ого члена аn=5n+1.Наидите сумму членов арифметическои прогрессии с пятнадцатого по пятьдесят пятыи включительно.

докажите неравенство sin^(2)a*cos^(2)a=<1/4

Поезд отправился из петербурга в 23часа 15 мин и прибыл в москву в 6 часов 25 мин следующего дня. по пути он сделал 22 остановки на станции бологое и в городе тверь, по 5 минут каждая.. с какой скоростью двигался этот поезд, если он прошёл 651 км

сделайте пож в места пропуск поставьте правильную форму,на завтра,заранее спасибо)

1.I dressed and want to be nearby pizzeria, but it ______.(close)
2.To make the situation ____, all the shops in our neighbourhood were not working on sunday.(bad)
3.Suddenly the phone rang. Hi, dear! it was Julia. Happy birthday! I _____ a birthday cake for you right now. When it's ready, I'll bring it to you and we'll cook a delicious pizza. I've got a detailed recipe.(make)
4.Julia is the ____ of all my friends! She always comes when I need help.( good )
5.First, I was thinking about buying a nice watch but watches were too ____ for me( expense

6.Then I thought about a new computer game, but it was too ____. I was sure that Mike would get several CDs for his birthday and he would never remember which one was mine.( tradition )
7.Then I thought of buying a book about a famous  ______, but that was not original either. I needed to find something original- but what could it be(travel).
8.Sudden , I saw bright mulyicoloured letters An artist's dream.(  sudden )
9.Yes , that was exactly what I needed -pencils, brushes,watercolours, oils- what could be better for a boy who had been crazy about painting since his early ____? I eas sure that I would find a wonderful present for Mike there.( child )