How do i write five and six hundred nine thousanths

Find the domain of the following expression: 1/(√x)-2

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years