How do you find Cos (2 theta) when Cos theta is 21/29​

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

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.