6 times as many as 6 is 30. True or False

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Standard deviation of 19,29,21,22,23