Who can help me with some questions for geometry 11th grade level? id appreciate it so much :)

Subtract 8 1/6 - 4 5/6 . simplify the answer and write as a mixed number.

Which term best describes the association between variables a and b

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.