I am a number with 45 tens and 3 ones. What number am I

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?

Can someone me out here and the tell me the greatest common factor

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2