Which expression is equivalent to 2(a+2b)-a-2b?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

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?

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2