Which statements below would be a logically equivalent way of defining a square?

What is the value of x in the diagram below?

What is the area of mnp? 40 m2 60 m2 68 m2 127.5 m2

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?