What is point-slope form? when can you use point-slope form? how is it useful?

Sketch one cycle if the cosine function y=2cos2theta

There is an entrance to the computer room at point e which lies on ab and is 5 feet from point a. plot point e on the coordinate plane. find the distance from the entrance at point e to the printer at point e

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83