How do i multiply a unit fraction with a whole number?

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

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.

1. are the triangles similar and if so why? what is the value of x? show your work.