What is x? where would i find it? 는 무엇이고 내가 그것을 어떻게 찾을까?

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c,with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

How do you solving the solution of each system using elimination?

9/10 divide by -3/15 as a mixed number