13+(x+8)=
i am so lost

On a piece of paper graph f(x)=5•(0.4)^x

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?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect