Answer the folling question if a= -22, b= 15 and c= 12. evaluate |a+b+c|. explain your answer.

What expression is equivalent to 1/2(2+3x-6)

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?

Precalculus question, image attached.