a code has five lines each line has two buttons. the code has to be a button from every line. how do calculate the number of different possibilities of combination types

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Acourt reporter is transcribing an accident report from germany. the report states that the driver was traveling 80 kilometers per hour. how many miles per hour was the driver traveling?

Afootball is throw by a quarterback to a receiver