It's due tomorrow i need answers i don't know what to do

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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?

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b