1 Frederick planted a tree in his backyard. He is 6 feet tall and his shadow along the ground has a length of 8 feet. The tree is currently casting a shadow along the ground that has a length of 24 feet. How tall is the tree?

9/10 divide by -3/15 as a mixed number

Could somebody me with this radical simplification?

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