Your aunt is 37 years old. this is 7 less than 4 times your brother's age. write and solve an equation to find your brother's age a.

i'm confused on what the equation will be.. me solve this. : )

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?