How can you prove that line 1 perpendicularly bisects lines 2 and 3 if 2 and 3 are parallel

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?

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

In the figure, triangle aob and triangle boc form a linear pair ,find the measure of x