оксид кальция+азотная кислота

продолжи закономерность на 4 числа:

2, 3, 5, 8, 13, 21...

 Помогите пожалуйста очень срочно нужно:)
1. Ask or answer questions about the following toys and gadgets according to the example. 
00) It is easy to use a notebook easy to use? 
0) It is easy to use a mobile phone. A mobile phone is easy to use.
1) It`s impossible to live without modern mobile phones.
...........................................................................................................
2) It`s comfortable to keep all my favourite music on MPЗ players. 
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3) It is interesting to learn with telescopes or cheistry sets.
........................................................................................................................
4) The electric scooters are fun because it is easy to ride them.
...........................................................................................................................
5) It is interesting for little kids to talk to Barney dinosaur and to play with him!
..........................................................................................................................................?
6) It is pleasnt to listen to Barney dinosaur because he can sing 17 songs!
Why........................................................................................................................................?
7) The Fur Real pets are good to undersand how to look after animals.
...............................................................................................................................................?

Какие отрасли химической промышленности должны иметь приоритетное развитие в современной экономике России и почему?

/у васи 9 монет по 5 р он хочит купить шокаладку за 20 р и пачку печенья за 15 р сколько денег у него осталось после покупки конфет и печенья помагите