The difference between three times x and four. how do u solve that and put it into a equation

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.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Find the values of y: 3y^3(y^2+ 2/3y)=0