What is the negative reciprocal of -18/9?

How is the number of vertices for a prism related to the name of the prism

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?

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?