The first term in an arithmetic sequence is 5. The third term in the sequence is -1. The tenth term in the sequence is -22. Which function can be used to find the nth term of the arithmetic sequence

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