5/9 ÷ 5/7 plz a short answer doing it now o i hate math plz so bad at it

Plz me plz i will give a brain just plz

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.

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry