How to find probability of a intersection b complement

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

Use circumcenter theorem to solve for the given values

What is 1/3x5 on anuber line what does it look like on a number line