Oof im stuck on this XD

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

What can you determine about the solutions of this system

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?