Radius is 21 5/8 incercepted by 5Pi/6? What is arc lenght?

The green family is a family of six people. they have used 4,885.78 gallons of water so far this month. they cannot exceed 9,750.05 gallons per month during drought season. write an inequality to show how much water just one member of the family can use for the remainder of the month, assuming each family member uses the same amount of water every month.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

What is the interquartile range (iqr) of the data set represented by this box plot?