How to solve and answer?

An equation where variables are used to represent known values—function notation 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

How do i put 3(x+7) in distributive property