Find the value of each expression -7+12+15

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

What is the upper quartile in the box plot?

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?