Given f(x)=2x+9, if f(x)=15, find 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?

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school

What is the area of a rectangle with vertices (-8,-2), (-3,-2), (-3,-6), and (-8,-6)? units