Please help will mark brainliest

In a right triangle, if a = 15m, c = 39m, what is b?

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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

Ahyperbola centered at the origin has a vertex at (-6,0) and a focus at (10,0)