Trig problem. i just need the letter for the answer

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

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.