Please help i need this and i have 3 other questions if u can help they gon be on my page

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?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.