I just need help on number 7 and 11

Measures of the angle of r, 31 s (x+4) t (3x+9)

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?

What numbers are included in the set of integers? what numbers are not included?