Answee and why is the answer you gave right

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.

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

In the diagram of circle o, what is the measure of zabc?