Need help asap please

Name the most appropriate metric unit for each measurement like the mass of cow

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

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?