The formula for volume of a sphere is v=4/3 nr3, but what does the 4/3 mean and what am supposed to do with it?

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.