Idon't know how to solve surface area

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.

Answer! if you don’t mind, can you explain

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?