All of number 3 plz and thank u!

Me with this one question, and i'll upvote the brainliest answer

Asphere has a diameter of 10 in. what is the volume of the sphere?

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