Anybody know the answers to this

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

With number 11 ( show how you got the answer)

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.