The volume of triangular prims.

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?

Can some one explain this i got sent this. is this a threat i’m scared

2/3(-6y+9x) expand each expression using the distributive property