по какому принципу образованы ряды? дайте краткий ответ

1) 1589, 1721, 1918-...

2)1774, 1791, 1812, 1829, 1878-     

3) антон фрязин, петр фрязин, марк фрязин, алевиз новый-  

выяснить существует ли треугольник с длинами сторон x y z с длинами сторон x,y ,z (в треуголнике большая сторона меньше суммы двух других сторон)

Use the infinitive or the gerund

1.Every summer I look forward to(to gather) the harvest in our garden.

2. She took my hand and kept on (to laugh).

3. Show me what (to do).

4.I suggest her (to read) poetry to the children.

5.When there were no telephones people used (to write) letters.

6.These words are difficult (to interpret).

7. I offered (to open) the door for the guests as all the rest were busy in the kitchen.

8.He was said (to be) a good scientist.

9. You will not succeeded in (to spend) a lot of advertising.

10.I don't get used (to eat) spicy food.

Составьте уравнение α распада для атома радия.