Help fast please :) :) :) :) :)

1. what is the formula for finding the vertical distance between two points on a coordinate plane?

For the equations below which statement is true ?

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?