Please help i will do anything i need this

The graph shown is the graph of which function?

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

Select all of the following expressions that are equal to 2.5.