What is the period of the graph of the equation y=3cos2x

Can (2,3 and square root 10) be sides ona right triangle?

Answer question above and explain each step : )

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.