Amap has a scale of 3 inches : 4 miles. if two cities are 18 inches apart on the map, what is the actual distance between the cities?

Can someone me and do the problem plz so i can understand it more better

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?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?