What is -8(r - 2) + 6(r - 2)

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?

Which of the following represents the length of a diagonal of this trapezoid?

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?