Is (256n²) a square number where n is a natural number now find n Please help please please please please

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

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?