How could someone find the length of a book?

3. solve the given inequality and graph the solution on a number line.

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?

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.