Pls help i need this soon :'3

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

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?

Secant be and cf intersect at point d inside a what is the measure of cde