Two perpendicular lines intersect to form four right angles.

Sorry guys but as you have a small brain

The sum of two numbers is 86, and their difference is 20. find the two numbers

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.