Plz help me 15 points and test is almost out to see question zoom in

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

How do you find principle and simple interest

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?