PLEASE HELP ME OLEASE UT URGENT !

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

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab