The coordinates of point T are (0,4). The midpoint of ST is (2,-4). Find the coordinates of point s. The other endpoint is (Type an ordered pair.)

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?

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

Write the equation in general quadratic form: plz !