What’s the gcf of 8 and 52

What is the volume of the sphere shown below with a radius of 3?

What is the value of x when x + 7 = 21?

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