How do you find how much tax to add

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.