Round 57640 to the nearest ten thousands

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

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

When the ball has traveled a distance of