I need help. I'm really stuck. I have been doing school work all day long. Sadie worked the most hours in Week -->___

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

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

What is the value for this expression? 2e-5