If ∠aor is 76°, what is the measure of ∠aos?

What is the size of the matrix resulting from

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?

X+ y = 5 ; x - y =3 solve using linear combination