Which undefined geometric term can be described as a one-dimensional set of points that has no beginning or end?

Select a graph that have an equation with a < 0

The total number of dental clinics total for the last 12 months was recorded

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