I'm pretty sure it's a but i just want to make sure

When only separate discreet points are graphed it is called?

Describe the domain and range of y=2(3)^x-2+5

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?