Help me please i don’t get it

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

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