If f(x)=-2x-3 evaluate based on f(-1)

Will mark brainliest. when ∆rst is translated 4 units down, what are the apparent coordinates of t’?

How do you use the elimination method for this question? explain, because i really want to understand!

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?