If y is proportional to x and y = -15 when x = -20, what is the value of x when y = 12?

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?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

Ihonestly have no clue if it's each or none.