Find the length of each arc. Round your answer to the nearest tenth. Show your steps, equations, and work.

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude

Which one ? is the answer and how to find this answer

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?