PLEASE HALP M

what is 50% of 4 ?

Ineed with number 17 i don’t get it at alll

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.

If the discriminant if a quadratic equation is 4 which statement describes the roots?