Which of the following statements are 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?

How do i multiply two digit numbers

Let x = a + bi and y = c + di and z = f + gi. which statements are true?