How to do you solve this?

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

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.

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths