What is the formula for axis of symetry x=

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?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0