What are the more appropriate measures of center and spread of each box plot?

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Astore has clearance items that have been marked down by 60%. they are having a sale, advertising an additional 55% off clearance items. what percent of the original price do you end up paying?