What is the z-score of each observations 22,23,21,22,25,26,22,22,21,19,22,22 ,26,23,24,21,22

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 is another way to express 36 +32

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.