Area of the blue shaded region? please show work

In the diagram of circle a what is m

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?