2/3 of 18 i need help on mobymax please

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?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer

What is perpendicular to y=-1/2x+11