дана арифметическая прогрессия  5, 3, 1, .....найдите сумму её первых 15 членов; решите пожалуйста кто может

Слова:
sports,popular,my,doing,very,is,family,in.
Я составила предложение-
My family is very popular in...sports doing или doing sport?
you,fit,do.how.keep-How do you keep fit?
favorite,is which,music,your,type,of-which type of music is your favorite?
parents,jogging,do,your,like- do your parents like jogging?
we,weekend,or,rugby,every,play,football- we play football or rugby every weekend. 

задачи внешней политики Александра 3го?

Помогите мне)

5. Put the verbs in brackets in Present Perfect Passive.

a) Football (play) in one form or another for hundreds year.

b) Football (include) in the Olimpicprogramme since 1900.

c) The Football Association Cup competitions (hold) sinse the middle of the 19th centure. d) Water polo (play) since 1869.

Боковая линия на разных стадиях онтогенеза имеется у представителей –  
I) рыб, II) земноводных, III) пресмыкающихся, IV) птиц, V) млекопитающих