The graph shows the number of prints Tara needs to sell to make a profit. What can you learn by looking at the graph?

Don't know how to find x given these segment lengths

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?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x