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Сумма цифр числа 287

1) 2/11*(14,1/3+2,1/6)

2) (21,3 -18,3/4):3,4

3) 16,5:2,75 - 1/19*57

4) 2,1/7:5/6*7/9 - 1,9

(0,9х + 4,55)*0,3=1,5

60,8 : (5,3х - 2,15) = 5

What categories of citizens are entitled(have rights) to social payments? Переведите текст 

When people work they must pay contributions to the National Insurance fund.Contributions are also made by the employer and the Government.National Insurance benefits are available to the unemployed,the sick and the retired/The disabled are also provided with financial help. Financial help is also available to the widowed.Every child is entitled may be. Social Security covers a wide range of payments, mainly to people who do not qualify for National Insurance payments. The main social groups who claim Social Security benefits are:single parents, the long-term unemployed, and pensioners whose pension is too low. People in full-tume work whose earnings are below a certain level can claim beneaits,too

2x^3+5x^2+x-2=0

подробно,пожалуйста!